a over 3 + 2a over 5. Do I cross multiply? Please help me.
Thank you.
2007-10-20 15:14:49 · 6 answers · asked by Kevin G 2 in Science & Mathematics ➔ Mathematics
a/3 + 2a/5
5a/15 + 6a/15
11a/15
2007-10-20 15:16:45 · answer #1 · answered by kelsey 7 · 3⤊ 0⤋
Only cross multiply when solving proportions. Here you add instead of an equal sign.
Find common denominator. (15) What you do to denominator you must to the numerator.
(5)a/3+2a/5(3)
5a/15+6a/15.......To put together
5a+6a/15........Combine like terms
11a/15
Your answer is 11a/15
2007-10-20 15:44:00 · answer #2 · answered by Anonymous · 0⤊ 0⤋
a/3 + 2a/5
= 5a/15 + 6a/15
= 11a/15
2007-10-20 15:38:58 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Kelsey has the best and absolutely correct answer - you make both fractions additive by adjusting them to be based on the least common denominator (smallest denominator that both have in common).
2007-10-20 15:25:15 · answer #4 · answered by John R 7 · 0⤊ 0⤋
the excellent undemanding denominator you'll be able to make is (x+a million)(3x+2). the 1st term, 3/(x+a million), turns into 3(3x+2) over (x+a million)(3x+2), or 9x + 6 over (x+a million)(3x+2) the 2nd term, 2/(3x+2) turns into 2(x+a million) over (x+a million)(3x+2), or 2x + 2 over (x+a million)(3x+2) So we've 9x + 6 - (2x + 2) for the numerator, it fairly is 7x + 4 the respond is (7x + 4) / (x+a million)(3x+2). whilst you're required to FOIL the denominator, it fairly is (7x+4) / (3x^2^ + 5x + 2)
2016-12-15 05:06:42 · answer #5 · answered by Anonymous · 0⤊ 0⤋
0.73333333333333repeating....a
2007-10-20 15:19:02 · answer #6 · answered by Vivian 3 · 0⤊ 1⤋