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3 years ago

Which expression is equivalent to 4y (y + 3) + 4 ( y − 3)? A 5y2 + 26y – 12 B 5y2 + 2y – 12 C 12y2 + 12y – 24 D 12y2 + 2y – 24

Mathematics

1 answer:

Nady [450]3 years ago

7 0

Answer:

4y (y + 3) + 4 ( y − 3)

4y^2 + 12y + 4y -12

4y^2 + 16y -12

Step-by-step explanation:

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3 years ago

Jenna can clean the gutters at her house in four hours. Her older brother, John, can clean the gutters in three hours, if they w

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Answer:

1 hour and 42.8 minutes

Step-by-step explanation:

To answer this question let's call $t_1$ while it takes Jenna to clean the gutters

Let's call $t_2$ while it takes John to clean the gutters

$t_1 = 4$ h

$t_2 = 3$ h

t = total time

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The speed of each one is:

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$V_2 = \frac{1}{3}$ g/h

$V = V_1 + V_2 = \frac{g}{t} = \frac{1}{t}$

So:

$V = V_1 + V_2 = \frac{1}{4} +\frac{1}{3}$

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