How many quarts of pure antifreeze must be added to 4 quarts of a 10% antifreeze solution to obtain a 50% antifreeze solution?

see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2

u bout ugly as   a mf

step-by-step explanation: lol