Question

Plz Helppppp and can u explain why ?

Answer 1

When we're asked to find the cube of a number, we're asked repeatedly multiply that number by itself 3 times. For instance, if we wanted to find the cube of 2 (2³), we'd find


`2*2*2`

which, in this case, equals 8. On the other hand, when we're asked to take the cube root of a number, we're being asked to find out which number, when multiplied by itself 3 times, gives us the number under the root sign. In our last example, finding the cube root of 8 (∛8) gets us:


`\sqrt[3]{8} =2`

since 2 x 2 x 2 = 8.

In your problem, we're being asked: "What number multiplied by itself gives us 64?" Or: ? x ? x ? = 64. Finding that answer takes some knowledge of the factors of 64. 64's prime factorization is
`2^6`, or 2 x 2 x 2 x 2 x 2 x 2. If we pair up all of the twos, we can rewrite this product as


`(2*2)*(2*2)*(2*2)`

or


`4*4*4=4^3`

since 4, when multiplied by itself 3 times, gives us 64, we know it must be our answer.

Answer 2

21.33333333333.... I think that is the right answer. I am sorry if I get it incorrect