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3 years ago

Real world situation for 834+14s>978-10s

Mathematics

1 answer:

Lapatulllka [165]3 years ago

5 0

834+14s=848>978-10s=968

a real life situation for that could be like how many apples 848apples/968total

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60<br> What is the sum of the series E3n?

wariber [46]

Answer:

B, 2,010

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2 years ago

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Slope intercept of 5x+2y= -2

Marianna [84]

Answer:

Step-by-step explanation:

5x + 2y = - 2

2y = - 5x - 2

y = $-\frac{5}{2}$ x - 1

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3 years ago

7 2,451 people came to watch the Easter parade. 745 of those people were adults. How many children came to the parade?

lukranit [14]

Take to total number of people attending and subtract the number of adults. The remainder are the children

2,451 - 745 = 1,706

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2 years ago

HELLO GUYS!!

Kipish [7]

The Area of the lawn is:

20m x 14m = 280m^2

The Area of the Circle is:

pi x 5^2 = 78.54

280 - 78.54 = 201.46m^2

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2 years ago

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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