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3 years ago

I need 14 and 16 pls

Mathematics

1 answer:

lisov135 [29]3 years ago

7 0

Answer:

Step-by-step explanation:

14 - If you add all she spent such as (1.95,30.00,7.50) then add it to what she has left over. You get $77.65

16- (63 x 2)+63+6=195

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2. Carl needs 15 hours longer than Jennifer to paint a room. If they work together, they can complete the job in 4 hours. Explai

nasty-shy [4]

Answer:

Jennifer would complete the job on her own in 5 hours.

Step-by-step explanation:

Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

$ax^{2} + bx + c, a\neq0$ .

This polynomial has roots $x_{1}, x_{2}$ such that $ax^{2} + bx + c = a(x - x_{1})*(x - x_{2})$ , given by the following formulas:

$x_{1} = \frac{-b + \sqrt{\Delta}}{2*a}$

$x_{2} = \frac{-b - \sqrt{\Delta}}{2*a}$

$\Delta = b^{2} - 4ac$

Rates

The together rate is the sum of their separates rate.

We have that:

Jennifer takes x hours to complete the job on her own, so her rate is 1/x.

Carl needs 15 hours longer than Jennifer, that is, 15 + x hours, so his rate is 1/(15+x).

The together rate is 1/4. So

$\frac{1}{4} = \frac{1}{x} + \frac{1}{15+x}$

$\frac{1}{4} = \frac{15 + x + x}{x(15+x)}$

$\frac{1}{4} = \frac{15 + 2x}{x(15+x)}$

Applying cross multiplication.

$x^2 + 15x = 4(15 + 2x)$

$x^2 + 15x = 60 + 8x$

$x^2 + 7x - 60 = 0$

Quadratic equation with $a = 1, b = 7, c = -60$ . So

$\Delta = 7^{2} - 4*1*60 = 289$

$x_{1} = \frac{-7 + \sqrt{289}}{2} = 5$

$x_{2} = \frac{-7 - \sqrt{289}}{2} = -12$

Since the time to complete the job has to be a positive value.

Jennifer would complete the job on her own in 5 hours.

4 0

2 years ago

Please figure out ASAP

VikaD [51]

Answer:

I believe that the answer is C because it seems to be the only reasonable answer , but i may be wrong , if i am correct please mark the brainliest

Step-by-step explanation

Answer:

x=12

5 0

3 years ago

Which of the following is equivalent to (-2) -5? -2+(-5) -2+(-5) 2+(-5) 2-(-5)

gladu [14]

-2+(-5) is equal to (-2)-5.

5 0

3 years ago

Read 2 more answers

Which of these system of linear equations has no solution

____ [38]

Answer:

Step-by-step explanation:

Those two lines are the same. If you divide the second equation by 2, you will end up with the first equation. A system of linear equations cannot have two of the same line.

5 0

3 years ago

Read 2 more answers

Evaluate f(0) given the following graph

ruslelena [56]

Answer:

f(0) = 1

Step-by-step explanation:

Assuming the graph is a function of x, then f(0) = 1.

Plug in 0 for x and ask yourself what is the y coordinate?

6 0

2 years ago