Answer:
7n+21=-28
Step-by-step explanation:
n=−7
Simplify both sides of the equation.
−28=7(n+3)
−28=(7)(n)+(7)(3)
(Distribute)
−28=7n+21
Step 2:Flip the equation.
7n+21=−28
Step 3: Subtract 21 from both sides.
7n+21−21=−28−21
7n=−49
Step 4: Divide both sides by 7.
7n/7=-49/7
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The area of the original piece of paper is 60cm
4:x = 28:42
x × 28 = 4 × 42
28x = 168
x = 168/28
x = 6
13
2c+2+6c-4
=8c-2
Answer: B
