A mixture of concrete is made up of 62.5% sand and 37.5% cement. How many cubic feet of sand and cement are needed to make 160 cubic feet of concrete mix?

1 is c

2 is a

3 is a

step-by-step explanation:

the terms of a geometric sequence can be found by beginning with the first term and multiplying by the common ratio repeatedly. a recursive formula for a geometric sequence with common ratio r is given by an=ran−1 a n = r a n − 1 for n≥2 n ≥ 2 .

step-by-step explanation: