Answer:
$16
Step-by-step explanation:
28/7=4
4*4=16
Answer:
9
Step-by-step explanation:
7r+18=r²
r²-7r-18=0
factorizing
r²+2r-9r-18=0
r(r+2)-9(r+2=0
(r-9)(r+2)=0
r-9=0
r=9
check
(r²)=(9*9)=81
7r+18=7(9) + 8=81
Answer:
y=3x+13
Step-by-step explanation:
3.5 + 2 = 2x - 10
5.5 = 2x -10
+10 +10
—————————
15.5 = 2x
—— ——
2 2
7.75 = x
7.75 is the answer
Multiply -8 on both sides

n + 2 = 32 Subtract 2 on both sides
n + 2 - 2 = 32 - 2
n = 30