Round the number to the place value of the BIG number. 68,974,512 and 8 is the big number?

Rewrite the following without an exponent. (5/8)-1

What is the simplified form of square root of 400 to the 100th power ?

The volume of a spherical hot air balloon v(r) = 4 3 ? r3 changes as its radius changes. the radius is a function of time given by r(t) = 3t. find the instantaneous rate of change of the volume with respect to t at t = 2.