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3 years ago

Joesphine scored 95, 84, and 87 on three math tests. She wants her average score for 5 tests to be at least 90.

Mathematics

1 answer:

attashe74 [19]3 years ago

7 0

Answer:

The answer for part B is I think 92 and 92. And for part A she could get 97 and 97 as the test average would be 92.

Step-by-step explanation:

I kinda explained it in the answer yeah but I hope that helps.

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Given f(x) = x^2 − 2x − 5.

lukranit [14]

Answer:

$(x - 1)^2 - 6$

Step-by-step explanation:

You need to know:

Vertex form = $a(x -h)^2 + k$

The vertex is at

(h, k)

<u>Need to know about perfect squares </u>

<u>Need to know how to complete the square.</u>

-----------------------------------------------------------------------------------------

<u>To convert $x^2-2x-5$ you need to complete the square on the equation.</u>

Complete the Square $x^2 - 2x -5$

$x^2 - 2x -5$

$(x^2 - 2x) -5$

Divide -2 by 2 and then square it.

$\frac{-2}{2} = -1$

$-1^2 = 1$

Add the one to the parentheses and subtract the one from the 5

$(x^2 - 2x +1) -5 -1$

Square $(x^2 - 2x +1)$

$(x-1)^2$

Now we have

$(x - 1)^2 -5 -1$

<u>Next add</u> -5 - 1 = -6

$(x - 1)^2 - 6$

Our quadratic is in vertex form now.

Vertex form = $a(x -h)^2 + k$

our equation = $(x - 1)^2 - 6$

Vertex = (1, -6)

5 0

4 years ago

A rocket is divided into three sections. The top section is one sixth the length of the bottom section . The middle section is o

Anastaziya [24]

Answer:

18 feet long.

Step-by-step explanation:

Let the bottom section be x feet long, then:

x/6 + x/2 + x = 180

Multiply through by 6:

x + 3x + 6x = 1080

10x = 1080

x = 108 feet,

So the top section = 108/6

= 18 feet long.

7 0

4 years ago

3x+2y=18 , 8x+6y=50 if x represents the cost of a birthday card and y represents the cost of a thank you note how much does each

elena55 [62]

(-9x-6y=-54) +(8x+6y=50)= -x=-4; x=4
3(4)+2y=18
12+2y=18
2y=6 ; y=3
Each birthday card costs 4

7 0

4 years ago

Explain the difference between the theoretical probability and finish odds

stepladder [879]

Answer:

Theoretical probability is what that you expect to happen to you while experimental is what actually happen when you try it out.

5 0

3 years ago

Read 2 more answers

456÷368<br> what is the answer

Paul [167]

<h3>Answer :</h3>

$\tt 456 \div 368$

$\tt = \dfrac{456}{368}$

$\tt = \dfrac{\cancel{456}^{228}}{\cancel{368}_{184}}$

$\tt = \dfrac{\cancel{228}^{114}}{\cancel{184}_{92}}$

$\tt = \dfrac{\cancel{114}^{57}}{\cancel{92}_{46}}$

$\tt = \dfrac{57}{46}$

$\pink{\tt \therefore \: Answer \: is \: \dfrac{57}{46} \: or \: 1.24 (approx.)}$

7 0

3 years ago

Read 2 more answers