I'll do one and see if you can follow the method.
You can either find the LCD (lowest common denominator) or just find any common denominator and then reduce. The LCD of 10 and 7 is 70... SO
Do you see the method?
I have 8 problems that I need to submit for homework they are multiple choice
1. 9/10 + 3/7
a. 12/17
b. 2/7
c. 93/70
d. 1
2. 18 = 4 - 2/7x
a. 77
b. -4
c. -49
d. -6 2/7
3. Evaluate: 4 - 1/2xy, for x = 6 2/3 and y = -5/6
a. 6 7/9
b. 5
c. -2/3
d. 1 1/3
4. 7 5/6 + 2 3/4 Add.
a. 9 7/12
b. 9 4/5
c. 10 7/12
d. 9 2/3
5. 2 1/4 - 9 4/7 Subtract.
a. -8 9/28
b. -7 9/28
c. 8 9/28
d. 7 9/28
6. 6 5/6y - 3 1/12 y Combine like terms
a. 3 3/4y
b. 3 1/3y
c. -3 2/3y
d. 3 3/4
7. (-5 3/4) . (- 3 7/9) Multiply
a. 21 13/18
b. 15 7/12
c. 8 3/4
d. -9 19/36
8. 32 divided by 4 5/8
a. 8 1/40
b. 6 34/37
c. 148
d. 8 5/8
Like the rest, this is an exercise in denominators. I am going to rewrite the fractions with the denominator 7*10 = 70.
And:
So
Now that we've done this, we can simply add the numerators:
Which is answer c).
-Dan
(Jameson, why is it we always pick the same examples to do? )
And,
Add them,
Multiply by seven,2. 18 = 4 - 2/7x
Thus,
Subtract 28 from both sides,
Divide by -2 thus,
.
We need to express the mixed fraction as a improper fraction:8. 32 divided by 4 5/8
a. 8 1/40
b. 6 34/37
c. 148
d. 8 5/8
Thus,
Thus,
Express back as mixed number,
6. 6 5/6y - 3 1/12 y Combine like terms
Now you have
You can't subtract these directly because they don't have... a common denominator! Yes this stuff never goes away.
Anyway, let's get the LCD.
LCD(6,12)=12
So
Now convert back to mixed number (which I think is stupid)...