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Alekssandra [29.7K]

3 years ago

12

Skylar's grades on four math tests are 85, 78, 77, and 69. What does Skylar need to score on the next test in order to have a me

an score of 80?

1 answer:

olga_2 [115]3 years ago

6 0

She needs to score a 91 on her next test because 85+78+77+69+91=400 and 400 divided by 5 gives you a mean of 80.

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is there a option for all of them?

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Anthony received $150 for his birthday this year. This was $10 less than half the amount

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Give the properties for the equation -2x 2 - y + 10x - 7 = 0.

Sladkaya [172]

Given:

The quadratic equation is

$-2x^2-y+10x-7=0$

To find:

The vertex of the given quadratic equation.

Solution:

If a quadratic function is $f(x)=ax^2+bx+c$ , then

$Vertex=\left(\dfrac{-b}{2a},f(\dfrac{-b}{2a})\right)$

We have,

$-2x^2-y+10x-7=0$

It can be written as

$-2x^2+10x-7=y$

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Here, $a=-2,b=10,c=-7$ .

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$y=-2(\dfrac{5}{2})^2+10(\dfrac{5}{2})-7$

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On further simplification, we get

$y=\dfrac{-25+36}{2}$

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Therefore, the correct option is A.

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3 years ago

I have the formula <br><br> A fraction • π r^2

MatroZZZ [7]

Answer:

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3 years ago