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Paladinen [302]

3 years ago

8

Anybody know ? Need help

1 answer:

jenyasd209 [6]3 years ago

4 0

Answer:

i think a but i’m not sure

sorry if wrong

Step-by-step explanation:

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What are the solutions of the quadratic equation (x + 3)(x +3) = 49? Ax = -2 and x = -16 Bx = 2 and x = -10 Cx = 4 and x = -10 D

Ivahew [28]

Answer:

4 and -10

Step-by-step explanation:

$\displaystyle (x + 3)(x +3) = 49 \\ x^2+3x+3x+9=49 \\ x^2 +6x+9=49 \\ x^2 + 6x + 9 - 49 = 0 \\x^2+6x-40=0 \\\\ \Delta=b^2-4ac \\ \Delta=6^2-4 \cdot 1 \cdot (-40) \\ \Delta=36+160 \\ \Delta=196 \\ \\ X_{1,2}=\frac{-b \pm \sqrt{\Delta} }{2a} \\ \\ X_1=\frac{-b+\sqrt{\Delta} }{2a} = \frac{-6+14}{2} = \frac{8}{2}=4 \\ \\ X_2=\frac{-b-\sqrt{\Delta} }{2a} = \frac{-6-14}{2}=\frac{-20}{2} = -10$

4 0

3 years ago

Rani takes a 40-question test. She answers 5% of the questions incorrectly

Feliz [49]

Answer:

2 Questions.

Step-by-step explanation:

To calculate a how much a percentage is of a number, you multiply the number by the percent.

So, we have the equation:

40 x 0.05 = 2

So, Rani got 2 questions incorrect.

Hope this helps!

5 0

3 years ago

Peter works part time for 3 hours every day and Cindy works part time for 2 hours every day.

Darina [25.2K]

Answer:

A) 13.50>9.00

B) $7

Step-by-step explanation:

A) 4.50*3=13.50 (Peter) 4.50*2=9.00 (Cindy)

B) Cindy would have to earn $7 an hour if she works 2 hours per day because 7*2=14

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storchak [24]

The answer is 4/17 or 0.235

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3 years ago

Which equation could be used to solve the question below?

Digiron [165]

I’m pretty sure the answer is D

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3 years ago

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