3^-2 is the same as 1/3^2
3^2 = 9
1/9
3^-2 = 1/9
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7+8+15 would be the double fact of 8+7=15.
Answer:
x=-2.5
Step-by-step explanation:
9×27+2×31-28= 7,567
n=7,567
40/28=10/x
Butterfly method
40x=280
/40 /40
x=7
EG is 7