$2n(2n+2)=168\\
4n^2+4n-168=0\\
n^2+n-42=0\\
n^2+7n-6n-42=0\\
n(n+7)-6(n+7(=0\\
(n-6)(n+7)=0\\
n=6 \vee n=-7\\
-7\not \in \mayhbb{N}\\\\
2n=12\\
2n+2=14$

These numbers are 12 and 14.

7 0

3 years ago

Solve for the variable b. 5a(b - c ) = d

Liula [17]

5a(b-c)=d. Here, we are trying to isolate the variable b.
Divide both sides by 5a: b-c=d/(5a)
Add c to both sides: b= $\frac{d}{5a} +c$

3 0

4 years ago

Read 2 more answers

Please help! Giving brainliest if you include explanation bc I need to learn this

zhannawk [14.2K]

Answer:

B is the most reasonable answer

Step-by-step explanation:

btw 9% of 578 is 52.02, so it works

7 0

3 years ago

Read 2 more answers

What interferes is equivalent to 25 3/2 ?​

What interferes is equivalent to 25 3/2 ?