Find the LCD of these fractions.
1. 3/8, 2/5 , i think it is 40 it that right?
2. 9/ x^2 , 2/ xy, 18/xy^2
a.x^2
b.xy
c.x^2y^2
d.y^2
find the missing number
3. 2/3x-1 = ?/9x-3
a. 3
b.4
c.6
d.9
Thanks!!! :)
2007-01-12 02:38:34 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Problem 1. Find the LCD of these fractions.
1. 3/8, 2/5 , i think it is 40 it that right?
LCM of 8 & 5 =40.
So LCD of 3/8, 2/5 is 40. Answer.You are right.
Problem 3.find the missing number 2/(3x-1) = ?/(9x-3.)
Let it be y. Then:
2/(3x-1) =y/(9x-3).
x cannot be equal to 1/3 as with this the two sides are not defined. Then we can multiply the two sides by (9x-3) and then,we get:
y=6 and that is the answer. Answer: c
Problem 2.Find the LCD of fractions. 9/ x^2 , 2/ xy, 18/xy^2
LCM of x^2, xy & xy^2 =x^2 *y^2
So LCD of the fractions is x^2 *y^2. Answer:c
2007-01-12 02:59:33 · answer #1 · answered by Anonymous · 1⤊ 0⤋
1). Since 8 and 5 have no factor in common,
their LCM is 40.You are right.
2. Which of your choices will x², xy and xy²
all go into evenly? The only one is c. x²y².
3. Notice that you multiplied 3x-1 by 3 to get 9x-3.
So you must do the same with 2: 2*3=6.
2007-01-12 14:32:33 · answer #2 · answered by steiner1745 7 · 0⤊ 0⤋
1. 40
2. x^2 y^2
3. 6
2007-01-12 10:58:36 · answer #3 · answered by Saphira 3 · 1⤊ 0⤋
Answer to the problem no. 2 = x^2y^2.
and
the answer to the problem no.3 = 6.
If you need explanation, please contact me.
2007-01-12 10:51:59 · answer #4 · answered by mani 2 · 0⤊ 0⤋
What is an LCD again?
2007-01-12 10:46:16 · answer #5 · answered by Andy P 3 · 0⤊ 2⤋