Find the sum of the first 13 terms of the geometric sequence shown below

4, 12, 36, 108,

the sum of the first 13 terms is?

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

Haley buys 9 pounds of apples for $3. how many pounds of apples can she buy for $1?

Astore sells two types of radios. one type sells $87 and the other for $119. if 25 were sold and the sales were $2495, how many of the $87 radios were sold a) 5 b) 20 c) 15 d)10