(x3)2 = __________.
Answer(s): B
(x3)2 is the same as (x3)(x3). To multiply exponents with the same base, keep the base and add the exponents:(x3)(x3) = x6.
If I inches of rain fall in one minute, how many inches fall in H hours?
Answer(s): D
To find out how much rain falls in an hour, multiply the amount that falls in one minute by 60 because 60 minutes make up an hour. In H hours, the amount of rain is 60IH.
If x = y, 6 + 4 (x - y) = __________.
6 + 4 (x - y) = 6 + 4x - 4y. Because x = y,4x = 4y.Therefore, 4x - 4y = 4x - 4x = 0, and6 + 0 = 6.
820 is a number between __________.
Answer(s): A
202 = 400, and 302 = 900, so the range of 20 to 30 is correct.
(x + 2)(x + 2) = __________.
(x + 2)(x + 2)x2 + 2x + 2x + 4x2 + 4x + 4
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