Multiply 3i(−1 + 2i). What is the simplified version written in standard form, a + bi, where a and b are real numbers?

The weekly cost to rent the car, f, as a function of the number of miles driven during the week, x, is f = 50 + 0.50x. If the weekly cost to rent the car was $100, the number of miles driven during the week is 200 miles.

The weekly cost to rent the car, f, as a function of the number of miles driven during the week, x, can be calculated using the formula f = 50 + 0.50x. This is because the car rental agency charges $50 per week plus $0.50 per mile. To find the number of miles driven during the week if the weekly cost to rent the car was $100, we can substitute f = 100 into the formula and solve for x:

100 = 50 + 0.50x

50 = 0.50x

x = 100/0.50

x = 200

Therefore, the number of miles driven during the week is 200 miles.

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To calculate the standard deviation, compute the mean, subtract it from each data point, square the results, average those and take the square root. Round to the nearest hundredth, and for one standard deviation below the mean, subtract the standard deviation from the mean.

To calculate the standard deviation of a data set, you can use a calculator or a computer. The formula for standard deviation is the square root of the variance, which is the average of the squared differences between each data point and the mean of the data set. Let's compute the mean and standard deviation of the provided data set: 2, 3, 5, 8, 2.03, 2.20, 2.6, 4.5.

You may round the standard deviation to the nearest hundredth as requested.

To find the value that is one standard deviation below the mean, subtract the standard deviation from the mean.

Final answer:

The proportion of data more than 2.0 standard deviations away from the mean in a normal distribution is less than 5%, consisting of 2.5% in the upper tail and 2.5% in the lower tail.

Explanation:

The proportion of values more than 2.0 standard deviations from the mean in a normal distribution is less than 5% because according to the empirical rule, 95% of the data falls within 2 standard deviations of the mean. Therefore, if you are looking at a normal distribution and you want to know the proportion of data that lies beyond 2 standard deviations from the mean, you would subtract 95% from 100%, which is 5%. This is then split between both tails of the distribution, so you have 2.5% in the upper tail and 2.5% in the lower tail, for a total of 5% more than 2 standard deviations away from the mean.

Final answer:

Based on the survey where 30% of 80 students favored math, the best estimate for the total number of students preferring math out of 300 at the middle school is 90 students.

Explanation:

In a random sample survey of 80 students at Torrey's middle school, 24 students said that math was their favorite subject. This represents 30% of the surveyed group (24 out of 80 students). To estimate the number of students who would say that math is their favorite subject throughout the entire middle school, we can use this percentage.

To find the estimated number of students who favor math in the whole school, which has 300 students, we apply the 30% to the total school population:

Therefore, the best estimate for the number of students who would say that math is their favorite subject at this middle school is 90 students.

The sum of the numbers in the series is -8208.

The sum of a series can be found using the formula for the sum of an arithmetic series, which is given by:

Sum = (n/2)(first term + last term),

where n is the number of terms and the first and last terms are provided in the series. In this case, the first term is 15 and the last term is -129. The common difference between each term is -4.

Using the formula, we have:

Sum = ([-129 - 15]/2)(15 + -129) = (-144/2)(-114) = 72 * -114 = -8208.

Therefore, the sum of the numbers in the series is -8208.

number 1 is a

number 2 d

The domain of the given step function is:

                       The set of all the real numbers.

Ceiling function--

The ceiling function also known as the least integer function is the function which takes the largest value of the integer for a non-integer number which lie between the two integers , and gives the integer itself if the number is integer.

and it is given by:

[tex]f(x)=\left \lceil x \right \rceil[/tex]

(

For example--

if x= 0.5

then f(x)=1  since x lie between 0 and 1

if x= -2.5

Then f(x)= -2

since x lie between -3 and -2.

if x=3

then f(x)=3  )

Also, the function is defined for all real values of x.

i.e. The domain of such a function is: All real numbers.

The function f(x) is given by:

[tex]f(x)=\left \lceil 2x \right \rceil-1[/tex]

Hence, the domain is all the real numbers.

Final answer:

The p-value for the one-tailed test, with the alternative hypothesis that the mean is greater than 650, is half the two-tailed p-value. Hence, the one-tailed p-value is 0.040.

Explanation:

The quality control engineer initially performed a two-tailed test with the null hypothesis that the mean force necessary to produce cracks in stressed oak furniture is 650. The calculated z-test statistic led to a two-tailed test p-value of 0.080. If the engineer had chosen an alternative hypothesis that the mean was greater than 650, the test would have been a one-tailed test. In a one-tailed test, you would only consider the probability on the side of the distribution that corresponds to the alternative hypothesis. Therefore, since the original two-tailed p-value was 0.080, for the one-tailed test, we would take half of that value which results in a p-value of 0.040.

Answer:

C. <8.5, -8>

Step-by-step explanation:

for PLATO users

Answer:

2r²-5r+2=0

a=2

b=-5

c=2

Step-by-step explanation:

Final answer:

The total Social Security tax for Ty's earnings this week, given his total earnings are now $110,600, is $155.00. This calculation considers the Social Security tax rate of 6.2% up to the income threshold of $110,100. Thus, option B is correct.

Explanation:

The question involves calculating the Social Security tax for Ty's earnings this week. With cumulative earnings to date at $107,600 and an additional $3,000 this week, Ty's total earnings for the year are now $110,600.

Since the Social Security tax rate is 6.2% and applies only up to an income of $110,100, we will only apply the tax rate to the $110,100 threshold, not the full $110,600. The week's Social Security tax is then:

0.062 × $110,100 = $6,826.20 (for the entire year so far)

Since we only need to find out the tax for this week's earnings, we need to calculate the tax that was already paid on the first $107,600:

0.062 × $107,600 = $6,671.20

The additional Social Security tax for this week is the difference between the two:

$6,826.20 - $6,671.20 = $155.00

Therefore, the total Social Security tax for this week is $155.00, which corresponds to option B.

The total amount of Social Security tax for Ty this week is $155.00. Hence, the correct option is B.

To calculate the total amount of Social Security tax for Ty this week, we must apply the 6.2% rate to his weekly pay of $3,000. However, since his cumulative earnings to date are $107,600 and the Social Security tax applies only up to $110,100, we need to determine how much of his $3,000 weekly salary is subject to this tax.

To find this, we subtract his current earnings from the maximum amount that is subject to Social Security tax: $110,100 - $107,600 = $2,500. Only $2,500 of Ty's $3,000 salary is taxable for Social Security purposes since he has reached the threshold beyond which Social Security tax is not levied on additional income.

Therefore, this week's Social Security tax is 6.2% of $2,500, which equals $155.00. As the rate for Medicare does not cap, the full $3,000 is subject to the Medicare tax at a rate of 1.45%, leading to a Medicare tax amount of $43.50. However, as the question only asks for the Social Security tax, the answer is B. $155.00.

To find the actual area of the forest preserve, the map area of 3.8 cm² is multiplied by the scale ratio squared (0.25 km²/cm²), resulting in an actual area of 0.95 km².

The area of the actual forest preserve can be calculated by using the scale given, which is 2 centimeters = 1 kilometer. First, we need to convert the area on the map into the actual area using this scale. Since the scale is linear and the area is measured in square units, we need to square the scale ratio to convert the area on the map to the actual area.

To do this conversion we consider that the scale of 2 cm : 1 km means that every 1 cm on the map is equivalent to 0.5 km (since 2 cm is 1 km). Therefore, for the area, we get the following ratio: (1 cm² = 0.5 km) × (1 cm² = 0.5 km), which simplifies to 1 cm² = 0.25 km². Now, we can find the actual area of the forest preserve by multiplying the 3.8 cm² area on the map by the value of each square centimeter in real-life units, which is 0.25 km².

Actual area = Map area × Scale ratio squared
= 3.8 cm² × 0.25 km²/cm²
= 0.95 km².

Therefore, the forest preserve has an actual area of 0.95 square kilometers.

The answer is 6 inches

Answer:

The correct answer is: Option: D

D. Maximum: 35°   ;  minimum: −15°  ; Period: 4 hours

Step-by-step explanation:

We are given a function f(t) as:

          [tex]f(t)=25\sin (\dfrac{\pi}{2}t)+10[/tex]

We know that the maximum value of the function is obtained when the sine function is maximum.

i.e. when sine takes the value=1

and the minimum value of the function is obtained when the sine function is minimum.

i.e. when sine takes the value= -1

Hence, the minimum value of the function is:

-25+10= -15

and the maximum value of the function is:

25+10=35

Also the period of the function of the type:

[tex]f(x)=a\sin(bx)+c[/tex]

is:

[tex]Period=\dfrac{2\pi}{b}[/tex]

Hence, here we have: b=π/2

Hence, period is:

[tex]Period=\dfrac{2\pi}{\dfrac{\pi}{2}}\\\\\\Period=4[/tex]

         Hence, option: D is the correct answer.