Need help plz very difficult

Speed in still water [tex]=[/tex] 9km

Speed of the current   [tex]=[/tex] 1 km

Answer:

Step-by-step explanation:

Speed of the current [tex]=[/tex] C

Speed of the still water [tex]=[/tex] S

Speed with the current [tex]=[/tex] [tex]([/tex] speed of the still water ₊ speed of the current [tex])[/tex]

                                      [tex]=[/tex] S ₊ C      

Speed with the current [tex]=[/tex] S ₊ C [tex]=[/tex] 10km

Speed against the current [tex]=[/tex] [tex]([/tex] speed of the still water ₋speed of the current [tex])[/tex]

                                              [tex]=[/tex] S ₋ C

Speed against the current [tex]=[/tex] S ₋ C [tex]=[/tex] 8km

Speed in still water [tex]=[/tex] Speed with the current ₊ Speed against the current[tex])[/tex]÷ 2

                                [tex]= ([/tex] 10 ₊ 8 [tex])[/tex] ÷ 2

                                [tex]=[/tex] [tex]([/tex] 18 [tex])[/tex] ÷ 2

Speed in still water [tex]=[/tex] 9km

Speed of the current [tex]= ([/tex] Speed with the current ₋ Speed against the current[tex])[/tex] ÷ 2

                                     [tex]= ([/tex] 10 ₋ 8 [tex])[/tex] ÷ 2

                                     [tex]=[/tex] [tex]([/tex] 2 [tex])[/tex] ÷ 2

Speed of the current   [tex]=[/tex] 1 km

Answer:

x = [tex]\frac{42}{5}[/tex]

Step-by-step explanation:

Given

19 - [tex]\frac{5x+6}{4}[/tex] = 7 ( subtract 19 from both sides )

- [tex]\frac{5x+6}{4}[/tex] = - 12

Multiply both sides by - 4 to clear the fraction and the negative signs

5x + 6 = 48 ( subtract 6 from both sides )

5x = 42 ( divide both sides by 5 )

x = [tex]\frac{42}{5}[/tex]

Answer: help me on my question

Step-by-step explanation:write the answer then submit it and thanks tou

Answer:

Step-by-step explanation:

5%= 0.05

10.94x0.05= 0.547

10.94+0.547= 11.487

Round to hundredths place (cents go two decimal places)

=11.49

Answer:

2X2/5 is less than 1

6X 1/5 is more than 1

4 X 1/4 is equal to 1

8 X 2/5 is more than 1

4 X 2/9 is less than 1

5 X1/4 is more than 1

Step-by-step explanation:

Answer:

Expressions less than 1

2×2/5, 4×2/9

Expressions that are equal to 1

4×1/4

Expressions that are greater than 1

6×1/5, 8×2/5, 5×1/4

Step-by-step explanation:

Given the first expression

2×2/5

= 4/5

= 0.8<1

0.8 is less than 1

- for the expression 6× 1/5

6×1/5

= 6/5

= 1.2>1

1.2 is greater than 1

- for the expression 4×1/4

= 4/4

= 1

This expression is equal to 1

- For 8×2/5

= 16/5

= 3 1/5

= 3.2>1

3.2 is greater than 1

- For the expression

4×2/9

= 8/9

= 0.89<1

0.89 is less than 1

- For the expression 5×1/4

= 5/4

= 1.25>1

1.25 is greater than 1

Answer:

x=49/4

Step-by-step explanation:

4/7=7/x

cross product

7*7=4*x

49=4x

x=49/4

Answer:

Each friend receives 4 pieces of gum. The answer is B).

Step-by-step explanation:

2 packs of gum=2*8=16 pieces of gum in total,

16/4=4

The correct answer is 4 gums

⇒each pack of gums contains 8 gums.

⇒there are 2 packs of gums

⇒total number of gums is 8×2=16

∴ each friend receives [tex]\frac{16}{4}[/tex]=4

so; g=4

What is the formula of the unitary method?

The formula of the unitary method is to find the value of a single unit and then multiply the value of a single unit by the number of units to get the necessary value

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Answer:

Zeros : 1 , -1, 3

Degree : 4

End Behaviour : At x-> ∞ f(x) -> ∞ and x->-∞ f(x) -> ∞

Y - intercept : -3

Extra Points: (0,-3), (2,-3)

Step-by-step explanation:

f(x) = 0 to find the zeros

[tex]Therefore (x+1)(x-1)^{2} (x-3) = 0[/tex]

Clearly x = -1,1,3

Here 1 is a repeating root as it is (x-1)²

Degree is highest power of x in f(x)

Clearly it is x*x²*x = x⁴ is the maximum power of x

Thus degree is 4

Looking at end behavior we substitute x->∞ and x-> -∞

Clearly f(x)>0 as all terms are positive and f(x)->∞

Similarly when x->-∞

f(x)>0 as 2 terms are -ve and their product is positive thus f(x)-> ∞

Y-Intercept is f(0)

f(0) = (0+1)(0-1)²(0-3) = 1*1*-3 = -3

Thus Y-Intercept is -3

Substitute x = 0 , 2 for extra points

Thus f(0) = -3

and f(2) = -3

Thus points on the graph (0,-3), (0,2)

We can use all this information to draw a graph remember that 1 is a repeating root so that will be a point of minima. The graph is a parabola that passes through x-axis at x = -1, 3.

Answer:

-3x + 8y - 96 = 0

Step-by-step explanation:

Standard form is ax + by + c = 0.

Converting from standard to slope-intercept form:

ax + by + c = 0

by = -ax - c

y = -a/b x - c/b

Compare the conversion formula to y = 3/8 x + 12.

In the equation, the slope is 3/8, which is the result of -a/b.

a= -3 and b=8

In the equation, 12 is a result of -c/b.

If b is 8:

-c/b = 12

-c/8 = 12

-c = 96

c = -96

Test a= -3 and b=8 and c= -96 in standard form converts to y=3/8 x+ 12

ax + by + c = 0

-3x + 8y - 96 = 0

-3x + 8y = 96

8y = 3x + 96

y = 3/8 x + 96/8

y = 3/8 x +12

This is correct. Therefore a= -3, b=8 and c= -96.

The standard form is -3x + 8y - 96 = 0

Answer:

The values of x are -3 and 5

Step-by-step explanation:

we have

[tex]x-\frac{15}{x}=2[/tex]

Multiply by x both sides to remove the fraction

[tex]x^{2} -15=2x\\\\x^{2} -2x-15=0[/tex]

The formula to solve a quadratic equation of the form

[tex]ax^{2} +bx+c=0[/tex]

is equal to

[tex]x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}[/tex]

in this problem we have

[tex]x^{2} -2x-15=0[/tex]

so

[tex]a=1\\b=-2\\c=-15[/tex]

substitute in the formula

[tex]x=\frac{-(-2)(+/-)\sqrt{-2^{2}-4(1)(-15)}} {2(1)}[/tex]

[tex]x=\frac{2(+/-)\sqrt{64}} {2}[/tex]

[tex]x=\frac{2(+/-)8} {2}[/tex]

[tex]x_1=\frac{2(+)8} {2}=5[/tex]

[tex]x_2=\frac{2(-)8} {2}=-3[/tex]

therefore

The values of x are -3 and 5

Answer:

E.

-3, 5

Step-by-step explanation:

Answer:

3/6.3=0.476190

Step-by-step explanation:

Answer:

.47 or 10/21

Step-by-step explanation:

3/6.3 = 10/21 or .47

Answer:

(x+4y)(x-4y)

Step-by-step explanation:

Since

[tex]\large a^2-b^2=(a+b)(a-b)[/tex]

we can see that

[tex]\large x^2-16y^2=(x+4y)(x-4y)[/tex]

Answer:

Step-by-step explanation: okay do your going to add 83.60 and 15. 35 then subtract 4.75

The final price of the stock is 94.2 dollars.

The correct way of simplifying an expression is first we will solve what is inside the brackets then we will solve the divisions then we will do the multiplications the we will do the additions and in last we will do the subtractions.

According to the given question

A share of stock costs $83.60. The next day, the price increases $15.35

∴ The price next day is

= (83.60 + 15.35) dollars

= 98.95 dollars.

The following day the price decreases to 4.75 dollars

∴the price of the stock on the following day is

= (98.95 - 4.75) dollars

= 94.2 dollars.

We can also do the following question in this manner also

A share of stock costs 83.60 dollars next day next day it increases by 15.35 dollars and the following day it decreases by 4.75 dollars

∴ The final price is

= ( 83.60 + 15.35 - 4.75) dollars

= 94.2 dollars.

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Answer: 30

Step-by-step explanation:

Answer:

6

Step-by-step explanation:

you do 5x6 and that gives you 30 and then to double check your answer you  do 5 divided by 30 :)

Answer:

NO

YES

NO

NO

Step-by-step explanation:

For a number to be the solution of the equation, the number should satisfy it.

To check if t satisfies, plug the number and compare LHS and RHS.

1) 3z + 4 = 15

Substituting z = -5, we get 3(-5) + 4 = -15 + 4 = -11 [tex]$ \ne $[/tex] 15.

Therefore, -5 is not the solution of the equation.

2) 8 - [tex]$ \frac{x}{2} $[/tex] = 0

Substituting x = 16, we get 8 - [tex]$ \frac{16}{2} = 8$[/tex]

⇒ 8 - 8 = 0

Therefore, 16 is a solution of the equation.

3) 4(p + 5) = 60

Substitute p = 12. 4(12 + 5) = 4(17) [tex]$ \ne $[/tex] 60.

Not a solution.

4) 8 - k = -48

If k = -40, then 8 - (-40) = 48

On the RHS we have -48. Not equal. So, it is not a solution.

Answer:

C) 7

Step-by-step explanation:

10/2=5

6/3=2

---------

5+2=7

Answer:

The standard from of the expression is: [tex](x +1)^2 + (y-1)^2  = (2)^2[/tex]

Step-by-step explanation:

Here the given expression is :

[tex]x^2+2x+y^2-2y=2[/tex]

Now, the standard form of a circle is given as :

[tex](x-h)^2 + (y -k)^2  = r^2[/tex]

Here, (h,k)  = Coordinates of Center,   r = Radius

Also, use the algebraic identity:

[tex](a \pm b)^2 = a^2 + b^2 \pm 2ab\\[/tex]

Now, converting the given expression in the standard form, we get:

[tex]x^2+2x+y^2-2y=2[/tex]

Add 2 on both sides of the equation, we get:

[tex]x^2+2x+y^2-2y  +2=2  + 2\\\implies x^2+2x + 1 +  y^2-2y + 1  = 4\\\implies  (x^2+2x + 1 )+  (y^2-2y + 1)  = 4\\\implies (x +1)^2 + (y-1)^2  = (2)^2[/tex]

So, here the standard from of the expression is:

[tex](x +1)^2 + (y-1)^2  = (2)^2[/tex]

Center coordinates here are  (h,k)  = ( -1 ,1) and Radius  = 2 units

Answer:

θ = ±π/3 + 2kπ

θ = 0 + 2kπ

Step-by-step explanation:

2 sin² θ + 3 cos θ = 3

Use Pythagorean identity:

2 (1 − cos² θ) + 3 cos θ = 3

2 − 2 cos² θ + 3 cos θ = 3

0 = 2 cos² θ − 3 cos θ + 1

Factor:

0 = (2 cos θ − 1) (cos θ − 1)

cos θ = 1/2

θ = ±π/3 + 2kπ

cos θ = 1

θ = 0 + 2kπ

Answer:

The answer is 59 & 79

Step-by-step explanation:

59+79=138

79-20=59

59+20=79

Answer:

OPTION C

Step-by-step explanation:

An element in the domain should be mapped to exactly one element on the co-domain. Also, every element in the domain should be mapped to an element in the co-domain.

These two conditions are satisfied to call a relation, a function.

Two different elements in the domain can be mapped to the same element in the co-domain. But the same element in the domain cannot be mapped to two different elements in the co-domain.

A) (1,2), (3,4), (5,6), (3,-4)

Here, the element '3' is mapped to 4 and -4. So, this is not a function.

B) (8,4), (4,3), (2,2), (8,1)

'8' is mapped to 4 and 1. So, it is not a function.

C) (2,5), (3,10), (4,15), (5,20)

All the elements in the domain are mapped to an element in the co-domain.  Also, every element in the domain has exactly one image in the co-domain. So, this relation is a function.

D) (2,4), (2,3), (2,1), (2,0)

The element '2' has more than one image. Clearly, it contradicts the definition of a function.

So, only OPTION C is the answer.

Answer:

1849 handles

Step-by-step explanation:

Break Even is the point when costs = profit

Since each handle takes $0.20 to make (cost) and they sell it for ($4.20), the profit from each handle is:

Profit = 4.20 - 0.20 = $4

The weekly costs are $7396. Break even would mean to gain this amount from selling handles (profit).

So, from each handle, we get $4 and to make $7396, we would need:

7396/4 = 1849 handles

Answer: The correct graph is the bottom left graph.

Step-by-step explanation:

Given function is f(x)=ceil(x+1)

To plot graph of f(x) in interval of(-3,3) :

ceil(x+1) is ceiling function

The output of ceil(x) is least integer greater than x

for example ceil(5.5)=6

For an interval of (-3,-2):

Take x=(-2.4)

x+1=(-1.4)

y=f(x)=ceil(x+1)=(-1)

Similarly,

For an interval of (-2,-1):

Take x=(-1.4)

x+1=(-0.4)

y=f(x)=ceil(x+1)=(0)

For an interval of (-1,0)

y=f(x)=1

For an interval of (0,1)

y=f(x)=2

For an interval of (1,2)

y=f(x)=3

For an interval of (2,3)

y=f(x)=4

Thus, The correct graph is the bottom left graph.

Answer:

The bottom left graph

Step-by-step explanation:

I took this quiz

Answer:

20 weeks

Step-by-step explanation:

200-1.5x=180-.5x

20=1x

X=20

Answer:

No, Richard is incorrect, the current temperature is 40 degrees.

Step-by-step explanation:

4x-40=3x

4x-3x=40

x=40

Step-by-step explanation:

Do 25% of $55 which is $13.75

You have the right idea but you're supposed to then subtract $13.75 from the original

So:

55 - 13.75 = $41.25

Answer:

Well, It is but not because..rotation symmetry, and a square has -turn (or 90-degree) rotation symmetry. As you may have already observed, many figures have 180-degree rotation symmetry but no other rotation symmetry. A figure has 180-degree rotation symmetry if it looks the same when turned halfway around...Soo yeah..I think I am right, So sorry if I'm wrong.

Step-by-step explanation:

Yes, a figure can have 90° rotational symmetry but not 180° rotational symmetry.

Yes, it is possible for a figure to have 90° rotational symmetry but not 180° rotational symmetry. To understand this, think about the number '6'. If you rotate it 90° clockwise, it looks exactly the same, but if you rotate it 180°, it becomes '9'. So, the figure has 90° rotational symmetry but not 180° rotational symmetry.

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Answer:

Associative

Step-by-step explanation:

Associative property is the one that says that when 3 or more numbers are summed, the grouping of such numbers has no effect on the result of the sum. It is:

(a + b) + c = a + (b + c) for every a, b and c real numbers.

Answer:

7/10

Step-by-step explanation:

because .7*10 = 70 and it would  be 70/100 so you simplify it to 7/10

Answer:

[tex]\frac{7}{9}[/tex]

Step-by-step explanation:

Given

0.77......

We require 2 equations with the repeating part after the decimal point.

let x = 0.77.... (1) ← multiply both sides by 10

10x = 7.77.... (2)

Subtract (1) from (2) thus eliminating the repeating decimal

9x = 7 ( divide both sides by 9 )

x = [tex]\frac{7}{9}[/tex]

Answer:

88

Step-by-step explanation:

Answer:

$13.50

Step-by-step explanation:

So your total would be $88.50