Mathematics, 22.08.2019 23:30 eylinglez3ovm16v
Lea buys 20 picture frames. some are 4 in. by 6 in. frames which cost $5.80 each, and the rest are 5 in. by 7 in. frames that cost $9.60 each. she spends a total of $80.80.
which equation models this situation?
let f represent the number of 4 in. by 6 in. frames she buys.
a.
9.6f + 5.8(20) = 80.8
b.
5.8f + 9.6(20 – f) = 80.8
c.
(5.8 + 9.6)(20 – f) = 80.8
d.
9.6f + 5.8(f + 20) = 80.8
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