7.5 to the Second Power is 7.52.
7.52 = 7.5 x 7.5 = 56.25
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there is 60 to 75 power strokes per second, 450 per min
This depends on how you place the parenthses- do you mean (3x) all to the second power or 3 times x to the second? In the first case, the 3 becomes 9 and so the answer is 9 times 25= 225. In the second case, the answer is 3 times 25 = 75.
2a to the second power. If you combine the like terms, (a to the second power + a to the second power), it would be the same as 2a to the second power.
To convert 75 feet per second to feet per minute, you would multiply by 60 since there are 60 seconds in a minute. So, 75 feet per second is equivalent to 75 x 60 = 4500 feet per minute.
8x to the second power is 64x2