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GenaCL600 [577]

2 years ago

14

Ms. Hamby gave a quiz. Two students' work and the answer key are shown. Ms. Hamby accepts equivalent answers in any form. Part A

Based on Ms. Hamby's answer key, how many questions did Student A answer correctly? Explain your response.

1 answer:

Zina [86]2 years ago

4 0

Answer:

attach a picture

Step-by-step explanation:

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Solve by completing the square? Could you please work it out step-by-step?

DaniilM [7]

16 n^2 -10n + 129 = 8n^2 -8

We collect the terms:
8n^2 -10n + 137 = 0

The steps for completing the square:

1) Move the "non X" (or "non N") term to the right:

8n^2 -10n = -137

<span>2)<span> Divide the equation by the coefficient of N² which in this case is 8
n^2 -1.2n = </span></span><span><span>-17.125 </span>

3) Take the coefficient of "N"; divide it by 2; square it; add it to both sides of the equation.
-1.2 / 2 = -.6
-.6^2 = .36

</span>
n^2 -1.2n +.36 = <span>-17.125 +.36

Take the square root of both sides:</span>
(n-.6)*(n-.6) = sq root( <span> <span> <span> -16.765 </span> </span> </span> )
That's about as far as I can go.

4 0

3 years ago

What is 15-4-12? I NEED HELP ASAP! Ps we’re learning about subtracting integers on this problem.

Tatiana [17]

It's -1.

15 - 4 = 11

11 - 12 = -1

6 0

2 years ago

Match each expression to its simplified form 9(x+2)

morpeh [17]

Answer:

You forgot to add a picture-

Step-by-step explanation:

7 0

2 years ago

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Solve using the elimination method:<br> X-3y=7<br> 3x + 3y=9

sergij07 [2.7K]

Answer:

$x=4\\\\y=-1$

Step-by-step explanation:

Given Equation:

$x-3y=7$ Equation:1

$3x + 3y=9$ Equation:2

Dividing Equation:2 by '3' both the sides:

$x+y=3$

or $x=3-y$ Equation:3

Putting the vale of 'x' in Equation:1

$x-3y=7$

$(3-y)-3y=7\\\\3-y-3y=7\\\\3-4y=7\\\\$

Subtracting '3' both sides

$-4y=7-3\\\\-4y=4$

$y=\frac{4}{-4}$

$y=-1$

Putting value of 'y' in Equation:3

$x=3-y$

$x=3-(-1)\\\\x=3+1\\\\x=4$

The solution of the equations is :

$x=4\\\\y=-1$

7 0

3 years ago

(x – 4)(x+6)<br> Need help simplify

Ksivusya [100]

The answer would be 2x^2+2x-24

using foil, you would multiply together x & x, x & 6, -4 & x, and -4 & 6, then add them together.

5 0

3 years ago

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