Lucy's family purchased one sweatshirt and 4 t-shirts for $110. mark's family bought three sweat-shirts and 4 t-shirts for $200. determine the cost of a t-shirt and a sweatshirt.

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

i think it’s c i believe