Answer:
d) 
Step-by-step explanation:
we simplify
by doing 7 x 2 = 14
so it is now

to check, we can use a calculator.
7 to the power of 14 = 678223072849
and
7 to the power of 7, squared also = 678223072849
Hope this helps!
Because without place value you might put the decimal in the wrong place and that will effect the answer big time.
Multiply everything by 2 then combine like terms
Answer:
D.) 100 feet squared
Step-by-step explanation:
10 X 6=60
10 X 4=40
60+40=100