if the height of a rectangular prism is doubled then the surface area of the prism is and I need work to PLEASE HELP ME
Answers
.. S = 2(LW +H(L +W))
If you double the height, now you have new surface area S'
.. S' = 2(LW +2H(L +W)) = 2(LW +H(L +W)) +2H(L +W)
.. = S +2H(L +W)
This is larger than the original surface area S, but is not as much as 2S.
Selection C is appropriate.
Related Questions
What is the expression for "the sum of 8 times a number and two"? 8 × 2N 8N + 2 8(N + 2)
Answers
Answer:
Option B. 8N + 2
Step-by-step explanation:
Expression given in the question is " the sum of 8 times a number and two" will be = (8 times N + 2)
= 8N + 2
Therefore, option B. is the answer.
A rectangular prism has a length of 5 centimeters, a width of 5 centimeters, and a height of 10 centimeters. The surface area of this prism is 250 square centimeters.
True or False
Answers
The lifetimes of batteries produced by the juicy battery company are normally distributed with a mean of 100 hours and a standard deviation of 10 hours. find the number of hours where at least 90% of the batteries will continue to operate at.
Answers
P(0.9)=1.28
sup[pose the number of hours whereby at least 90% of the batteries will continue to operate is x.
the z-score is given by:
z=(x-μ)/σ
where:
μ is the mean
σ is the standard deviation
substituting the values we shall have:
1.28=(x-100)/10
solving for x we get:
x=112.8 hours
In △ABC, AB = 7 and AC = 17. Find m∠B to the nearest degree
68
38
21
87
Answers
Answer:
The m∠B is 68°
Step-by-step explanation:
Given the right angled triangle ABC in which right angled is at A.
AB = 7 units and AC = 17 units
we have to find the measure of ∠B.
By trigonometric ratios,
[tex]cot \angle B=\frac{AB}{AC}[/tex]
[tex]cot \angle=\frac{7}{17}[/tex]
[tex]\angle B=cot^{-1}(\frac{7}{17})[/tex]
[tex]\angle B=67.619864948\sim 68^{\circ}[/tex]
Hence, the m∠B is 68°
Option 1 is correct
On a standardized test raw answer the first 22 questions in 5 minutes there are 77 questions on the test if he continues to answer questions at the same rate how long will it take him to complete the test from start to finish
Answers
If you answered 22 questions on the test in 5 minutes, there will be an unequal time amount. 22 x 3 = 15 minutes (66 questions) 22 x 4 = 20 minutes (88 questions).
Therefore, it would take you 17.5 minutes to finish all the questions on your test.
Enjoy.
Answer:
Step-by-step explanation:
17.5
Edgar has a bird bath that holds 2 gallons of water. He only want to fill it 3/4 full. How much water in gallons should Edgar put in the bird bath?
Answers
2 × 3/4 = 6/4 = 1 1/2
Edgar should put 1 1/2 gallons of water in the bath.
Hope this helps!
Bella Sandino failed to pay her cell phone bill in the amount of $85.14 by the due date of March 4. Calculate the amount Bella must pay on March 20 if the company charges 20% interest on late payments. Assume a 365-day year.
Answers
If f(x) = 0.5x and g(x) = 0.25x. Which statement is true?
Answers
PLEASE SEE ATTACHED IMAGE.
First, we rewrite both functions correctly:
f (x) = 0.5 ^ x
g (x) = 0.25 ^ x
We observe that they are exponential functions, where, rewriting:
f (x) = (1/2) ^ x
g (x) = (1/4) ^ x
We observe that both graphs present an exponential decay where, f (x)> g(x), since, the rate of change of f (x) (1/2) is greater than the rate of change of g (x) ( 1/4).
Answer:
as -> infinity, f (x)> g (x) *
Gavin's mean score on 3 math tests is 87. What equation can be solved to find x, the score he needs on his next test to bring his mean score up to 90?
Answers
To find the score Gavin needs on his next test to have an average of 90, we understand that the sum of his first three tests and the fourth test, divided by four, must equal 90. Translating this understanding to an equation gives: (261 + x4) / 4 = 90, which can be solved for x4.
Explanation:The subject posed deals with the understanding of mean averages and algebra. The mean, or average, is calculated by adding up all the values and dividing by the total number of values. In Gavin's case, his mean score of 87 over three tests can be represented algebraically as (x1 + x2 + x3) / 3 = 87. The challenge is to find out what Gavin needs to score in his next test (let's call this x4) to have a new mean score of 90.
To set up the equation we need to understand that now the average is calculated over four tests, and it must equal 90. Thus, the equation to solve is ((x1 + x2 + x3) + x4) / 4 = 90. As we know that the sum of his first three test scores is 87 * 3 (because (x1 + x2 + x3) / 3 = 87), we substitute that sum (261) into the equation:
(261 + x4) / 4 = 90. Solving this equation for x4 will give the score Gavin needs on his next test to achieve an average of 90.
Learn more about Mathematics Mean Average here:https://brainly.com/question/33190926
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the function f(x)=a^x-4 will never cross the x-axis. true or false
Answers
Answer: False
Solution:
The exponential functions with the form y=a^x never cross the x-axis (x-axis is an asymptote), but in this case we have the exponential function translated 4 units downward, then this function crosses the x-axis.
As it is not given a is positive real number or negative real number.
By supposing a is any real number, we will draw the graph of the curve
[tex]a^x-4[/tex] by taking different values of x.
As i have taken different values of a ,
I found that for a< 0, the graph of the curve [tex]y=a^x-4[/tex] does not exist.
For any other value of a, the curve cuts the x axis at one point.
For values of 1<a<0, the curve will cut negative side of X axis.
For value of a, a≥1, the curve will cut positive side of X axis.
For , a=0, the curve will not cut the x axis.
So, The function , f(x)=[tex]a^x -4[/tex] will cuts the x axis at one point for a >0 and for negative values of a, and for a< 0 ,it will not cut the x axis.
Suppose 60% of the people in a town will get exposed to flu in the next month. if you are exposed and not inoculated then the probability of your getting the flu is 80%, but if you are inoculated that probability drops to 15%. of two executives at beta company, one is inoculated and one is not. what is the probability at least one will not get the flu? assume that the events that determine whether or not they get the flu are independent.
Answers
P(Non-inoculated getting flu) = 0.6*0.8 = 0.48
P(Both getting flu) = 0.09*0.48 = 0.0432
P(Atleast 1 not getting flu) = 1-0.0432 = 0.9568
what is the answer to this word problem??
Answers
So,
1st service
10m + 20
1. 10 + 20 =30
2. 10x2=20+20=40
3.10x3=30+20=50
4.10x4=40+20=60
5.10x5=50+20=70
2nd service
11m + 15
1. 11+15=26
2. 11x2=22+15=37
3 11x3=33+15=48
4.11x4=44+15=59
5.11x5=55+15=70
So, the 5th month the services cost the same
Hope this helps! ;)
During the two hours of the morning rush from 8
a.m. to 10
a.m., 100 customers per hour arrive at the coffee shop. the coffee shop has a capacity of 80 customers per hour. what is the number of customers waiting at 10
a.m.
Answers
Suppose that after he makes his first shot, he shoots exactly 5 more shots. what is the probability that, out of these 5 attempts, he makes an even number of shots?
Answers
.. 0.31250 +0.15625 = 0.46875
_____
p(2 of 5) = (5C2)/2^5 = 10/32
p(4 of 5) = (5C4)/2^5 = 5/32
For the above, we have assumed the probability of success is 1/2.
find the area of the right triangle with the base length 30 inches and height 3 feet
Answers
.. = (1/2)(2.5 ft)*(3 ft) . . . . . . 30 inches = 2.5 feet
.. = 3.75 ft^2
There were three trains made of the cars with exactly the same number of passenger's seats. The first train had 418 seats, the second 456, and the third 494. How many cars were in each train, if it is known that each train had not more than 50 cars?
1 train=?
2 train=?
3 train=?
Answers
.. 456 -418 = 38
.. 494 -456 = 38
So, if 38 divides these numbers evenly, that is the number of seats in each car. (It does).
train 1 had 418/38 = 11 cars
train 2 had 456/38 = 12 cars
train 3 had 494/38 = 13 cars
_____
The number of seats in each car could be a sub-multiple of 38, say 19. In that case, the number of cars in each train would be twice the number shown above. It is slightly unusual for a train car to have an odd number of seats, but is not unheard of.
One side of a triangle is increasing at a rate of 8 cm/s and a second side is decreasing at a rate of 3 cm/s. if the area of the triangle remains constant, at what rate does the angle between the sides change when the first side is 24 cm long, the second side is 35 cm, and the angle is π/6?
Answers
A' = (a'*b*sin(θ) +a*b'*sin(θ) +a*b*cos(θ)*θ')/2
0 = (8 cm/s)*(35 cm)*sin(π/6) +(24 cm)*(-3 cm/s)*sin(π/6) +(35 cm)*(24 cm)*cos(π/6)*θ'
0 = 140 cm^2/s -36 cm^2/s +420√3 cm^2*θ'
θ' = -104/(420√3) . . . . rad/s
.. = -26(√3)/315 . . . . . . rad/s
.. ≈ -8.19°/s
_____
The figure offers a sort of sanity check on the numbers.
i dont get this. can you explain
Answers
The middle column is a re-write of the first column and is equal to the third column. You can figure the numbers there from either direction. In the center row, you need 8.31 × ___ = 831. It should not be difficult for you to figure out the number in the blank is 100. (It is also the power of 10 between 10 in the first row and 1000 in the third row.)
The divisor in the first column is the inverse of the multiplier in the second column. 0.1 = 1/10, 0.01 = 1/100, and in the third row, 0.001 = 1/1000. The missing number in the first column is 0.001.
_____
The four missing numbers are 83.1, 100, 0.001, 8310. (top to bottom, left to right)
The relationship between the number of hours a plumber works and the total work fee she charges is proportional. Her fee for 5 hours of work is $350. Which of the following could be combinations of values for the plumber's work hours and total work fee she charges?
Answers
Answer: I saw someone else answer this and it doesn't match up with the choices so I decided to do this my self and for anyone else who might need this in the future. For those on Khan academy the answers are B, C, AND D.
Step-by-step explanation: I found the unit rate of 350 and 5, because we can use a calculator (as stated on top) I just punched in 350 divided by 5 and got 70. Now i know this may not sound that "professional", but nothing needs to always be professional as long as its efficient and most importantly gets you the right answer. I then took the time to multiply each number, (the ones on the left : 3, 3.5, 6, 7.25, and 8) by 70. If the answer you got on the calculator match up to the number on the right, (240, 420, 507.50, and 490) its correct, if it doesn't match up, you can tell that its most likely not the answer. You should end up with three answers that all end up having the unit rate of 70. Hope this helps anyone who needed it.
ANSWERS ARE B, C, AND D.
Following could be combinations of values for the plumber's work hours and total work fee she charges : 8 hours and $490, 7.25 hours and $500, 270 for 3 hours work. So, the correct choice of options for the image are B, C, and D.
Since the relationship between the number of hours a plumber works and the total work fee he charges is proportional, we can use the following equation to calculate the total work fee:
Total work fee = Number of hours worked * Hourly rate
Therefore, the following combinations of values for the plumber's work hours and total work fee are proportional:
8 hours and $490 (the hourly rate is $490/8 hours = $61.25)
7.25 hours and $500 (the hourly rate is $500/7.25 hours = $68.75)
6 hours and $420 (the hourly rate is $420/6 hours = $70)
The other two options, A and E, are not proportional.
For example, if the plumber works for 3 hours and charges $245, the hourly rate would be $245/3 hours = $81.67.
However, if the plumber works for 3.5 hours and charges $270, the hourly rate would be $270/3.5 hours = $77.14.
This shows that the hourly rate is not constant, so the relationship between the number of hours worked and the total work fee is not proportional.
The correct choice of options for the image are B, C, and D.
For similar question on hours
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A light bulb consumers 1800 watt-hours per day. How long does it take to consume 9450 watt-hours?
Answers
To find out how long it takes for a light bulb to consume 9450 watt-hours, when it uses 1800 watt-hours per day, divide 9450 watt-hours by 1800 watt-hours per day, which equals 5.25 days.
Explanation:The question involves calculating how long it takes for a light bulb to consume a certain amount of energy (9450 watt-hours) given its daily consumption rate (1800 watt-hours per day).
To find the duration, you simply divide the total energy by the daily consumption rate:
Total energy to be consumed = 9450 watt-hours
Daily energy consumption = 1800 watt-hours per day
Duration = Total energy ÷ Daily energy consumption
Duration = 9450 watt-hours ÷ 1800 watt-hours/day = 5.25 days
Therefore, it will take 5.25 days for the light bulb to consume 9450 watt-hours of energy.
Trigonometric Identities and Applications plz help
Answers
A recipe for bread calls for 4 1/4 cups of flour. Which expression gives the number of cups of flour needed if you want to make 3 1/2 batches of this recipe?
A. 3 1/2 + 4 1/4
B. 3 1/2 x 4 1/4
C. 4 1/4 ÷ 3 1/2
D. 4 + 1/2 + 3 + 1/2
Answers
Rachel jogged along a trail that was 1/4 (fraction) of a mile long. She jogged along the trail 8 times. How many miles did Rachel jog in all??
Answers
1/4+1/4 = 1/2 Mile
1/2+1/2 = 1 Mile
1+1 = 2 Miles
Given that P = (2, 9) and Q = (4, 14), find the component form and magnitude of vector PQ.
Answers
[tex] \sqrt{2 {}^{2} + 5 {}^{2} } = \sqrt{29} [/tex]
the component form is
<2,5>
We have P(2,9) meaning, x1=2, y1=9
And, Q(4,14) meaning, x2=4, y2=14
Now PQ = <4-2, 14-9> = <2, 5>
Now to find the magnitude, we use the distance formula aka the Pythagorean Theorem. a^2 + b^2 = c^2 and we have, x=2, y=5
So, 2^2 + 5^2 = c^2 =29
Therefore, the magnitude is c = sqrt of 29.
A snail traveled 3 over 8, of an inch in 3 minutes. How many inches can the snail travel in 9 minutes? Express the answer as a decimal
Answers
The snail travels this far in 3 minutes. To find out how far it travels in nine minutes, we have to find out how many times 3 goes into 9.
9 / 3 = 3
Now. we simply multiply our decimal by three in order to get our answer!
0.375 x 3 = 1.125 inches
The answer is 1.125 inches!
Help with this algebra math question please
Answers
We have then:
cot (x) = 1 / (tan (x))
Rewriting we have:
cot (x) = 1 / ((sin (x)) / (cos (x)))
We do double c:
cot (x) = cos (x) / sin (x)
Answer:
cot (x) = cos (x) / sin (x)
option 3
Johnson Certified bought a fiber optic cable for $975,000. The estimated life of the cable is 20 years, after which its salvage value is estimated to be $5,000. Using the straight-line method, what is the annual depreciation to the nearest cent?
Answers
[tex]D_{a}= \frac{C-R}{U} [/tex]
where
[tex]D_{a}[/tex] is the annual depreciation
[tex]C[/tex] is cost
[tex]R[/tex] is the salvage value
[tex]U[/tex] is the estimated life in years.
For our problem we know that [tex]C=975000[/tex], [tex]R=5000[/tex], and [tex]U=5000[/tex]. Lets replace those values in our formula to find [tex]D_{a}[/tex]:
[tex]D_{a}= \frac{975000-5000}{20} [/tex]
[tex]D_{a}= \frac{970000}{20} [/tex]
[tex]D_{a}=48500[/tex]
We can conclude that the annual depreciation of the optic fiber cable is $45,000
2) Suppose 3x + 4y = 52 and 5x + y = 30. What is the value of 8x − 2y?
Answers
Answer:
c
Step-by-step explanation:
At a grocery store a four-pack of yogurt costs $3.95. How much does each container of yogurt cost
Answers
Help! I’ve been stuck for like minuteeesss!!!
Answers
b. For each gallon, you can drive 348/14.5=24 miles. If you have 132 gallons, you can drive 132*24=3168 miles.