PLEASE HELP ME. ^^photos^^ I need help with this math please!!!!!

Mathematics

1 answer:

EleoNora [17]3 years ago

5 0

Answer:

17. 11x - 11y or 11x + (-11y)

18. -7.52 - 2.8 or -7.52 + (-2.8)

19. 41x - 21y - 6

20. -3y -8xy

Step-by-step explanation:

17. Use the distributive property.

18. Use the distributive property to multiply each number inside the parentheses by 0.4

19. Multiply each number inside the parenthese by 7.

20.Multiply each term in parenthese by y.

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Need help ASAP !!!!!!!

Anestetic [448]

First we distribute $\frac{1}{5}$ into $n$ and $-\frac{1}{7}$ .

$\frac{1}{5} * n = \frac{1}{5} n$
$\frac{1}{5} * -\frac{1}{7} = - \frac{1}{35}$

That makes the left side of the equation

$\frac{1}{5} n - \frac{1}{35} = \frac{1}{6} n$

Now we subtract $\frac{1}{5}n$ from $\frac{1}{6} n$ , which makes $\frac{1}{30}$

Now the equation is

$-\frac{1}{35} = -\frac{1}{30n}$

Our goal is to isolate $n$ , so we both sides by 30

$30* -\frac{1}{35} = - \frac{1}{30}n * 30$

That will make the equation

$- \frac{30}{35} = -n$

We multiply -1 on both sides of the equation:

$\frac{30}{35} = n$

Finally we simplify $\frac{30}{35}$ , which makes $\frac{6}{7}$

So the answer is $n = \frac{6}{7}$