Answer:
81
Step-by-step explanation:
u multiply 9 x 9 not 9x2
Answer:
-10 = a
Step-by-step explanation:
17 = a - 3 - За
Combine like terms
17 = -3 -2a
Add 3 to each side
17+3 = -3-2a+3
20 = -2a
Divide by -2
20/-2 = -2a/-2
-10 = a
Answer:
x=4
Step-by-step explanation:
5*4=20
20-7=13