Question

plz help will medal and fan

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

Answer 1

Elliminate the ones you know are wrong to make it easier.

Answer 2

a,c

Answer 3

What's your reasoning?

Answer 4

they dont make any sence to me

Answer 5

I wouldn't write it in any of the answers, I would do it as a system of equations to represent each frame, but since that's your answers, I would go with Do you understand why?

Answer 6

not really

Answer 7

is b right?

Answer 8

So, I would think it's a

Answer 9

ok do you know a site that i can check to see if its right

Answer 10

hmm, try google?

Answer 11

This is similar to another one i think i showed you... the info gives two equations, number total frames bought, and total cost

g = 5x7 frames
f = 4x6 frames

20 = e + f
and
80.80 = 5.80 * f + 9.60 * g

Answer 12

20 = f + g
80.80 = 5.80 * f + 9.60 * g
--------------------------

so from the first one, g = 20 - f
put that into the second
80.80 = 5.80 * f + 9.60 * (20 - f)