the answer of Y is ...?

0 ⤊

0.8(Y - 50 + 10) = 640
Y = ?

2007-10-10 11:43:03 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

0.8( Y- 50 + 10)= 640
0.8(Y-40)=640
0.8Y- 32 = 640
0.8 Y = 672
Y=840

You can plug in the value and you are going to get 640.

2007-10-10 11:52:17 · answer #1 · answered by Royes 3 · 0⤊ 0⤋

0.8[y - 50 + 10 ] = 640
parentheses
0.8[ y - 40 ] = 640
multiply
0.8y - 32 = 640
add to both sides
0.8y = 672
divide both sides
y = 840

2007-10-10 18:55:22 · answer #2 · answered by Nurse Susan 7 · 0⤊ 0⤋

840

2007-10-10 18:56:18 · answer #3 · answered by Anonymous · 0⤊ 0⤋

Snap

840

2007-10-10 19:39:25 · answer #4 · answered by Pug the Mighty 3 · 0⤊ 0⤋

Yes, I make it 840 as well.

2007-10-10 18:59:24 · answer #5 · answered by orange07974 2 · 0⤊ 0⤋