Help with math problems please. Thanks.?

Question

1. Reduce: 8 / 2x - 4

2. Reduce: x + 7 / x2 - 49

3. Convert 60 miles per hour to feet per second.

4. Solve: 7/x = 8/3

5. Simplify: x3/5 * x2/3

6. combine terms: 5^2 - 3^2 (^ squareroot)

7. Solve for x:
| x 2 |
| 6 2x| = 10x

8. Solve the system: cramer rule
x + y + z = 5
x - y + z = -2
2x + y - z = 4

5. Simplify: x^3/5 * x^2/3

Answer 1

1. Reduce: 8 / 2x - 4
8/2(x-2)
=4/(x-2)

2. Reduce: x + 7 / x2 - 49
x+7/(x+7)(x-7)
=1/(x-7)

3. Convert 60 miles per hour to feet per second.
50*5280/3600
=1.47*60 ft/sec

4. Solve: 7/x = 8/3
cross multiplying
8x=21
x=21/8
=2 5/8

5. Simplify: x3/5 * x2/3
is itpower?

6. combine terms: 5^2 - 3^2 (^ squareroot)
rt5-rt3=2.236-1.732=0.504

7. Solve for x:
| x 2 |
| 6 2x| = 10x
2x^2-12=10x
2x^2-10x-12=0
dividing by 2
x^2-5x-6=0
(x-6)(x+1)0
x=6 or -1

8. Solve the system: cramer rule .
x + y + z = 5
x - y + z = -2
2x + y - z = 4
{2/3,7,5/6}

Answer 2

1. Reduce 8/(2x – 4)

First: factor 2x – 4 into: 2(x - 2)

= 8/2(x – 2)

Second: reduce the whole numbers: 8/2 = 4

= 4/x - 2.

2. Reduce: x + 7 / x2 - 49

First: factor x^2 – 49 = (x + 7)(x -7)

= (x + 7)/(x + 7)(x – 7)

Second: cancel like terms: (x + 7)/(x + 7)

= 1/(x – 7)

4. Solve: 7/x = 8/3

First: get rid of fractions by taking the denominators and multiplying them by both sides:

(7/x)(3x) = (8/3)(3x)

Second: cross cancel like terms on both sides:

Cancel "x" from (7/x)(3x) = 21 and cancel (3) from (8/3)(3x) = 8x

21/8 = 8x/8
21/8 = x

5. Simplify: x3/5 * x2/3

x^3/5 * x^2/3

First: when you have the same base, add exponents:

x^(3/5 + 2/3)

= x^19/15

Answer 3

3) is 88 ft/s

one and two are going to be a little difficult because you don't have parenthesis around which one you need to do first. ex: #1 is it (8/2x) -4 or is it 8/ (2x-4). those will give you two different answers. same thing with #2 & #5

#6 (i think)is 2^2.(^ = squareroot) i think you don't do anything with the squareroot and just subtract 5-3

Answer 4

2+2(6+9) always multiply the first before adding 2+12+18 add 32 then work on the bottom half 8^2 + 5 work on 8^2 64+5 add 69 so you end up with... 32/69 put into lowest terms divide each side by 8 answer is... 4/9

Answer 5

1. 8/ 2x-4... factor 2x-4 so that it's 2(x-2)... then divide 8 by 2... the answer is 4/ x-2
I'll think about the others but...
4. use cross multiplication so that 8x= 21... divide each side by 8... answer is x= 21/8

Answer 6

1.
4/(x-2)

2.
1/(x-7)

3.
88ft per sec

4.
x= 2.625

5.
x^(19/15) if i understood the question correctly

6. don't understand question

7. don't understand question

8.
x=(2/3)
y=3.5
z= (5/6)

Answer 7

www.webmath.com
This is an excellent site. It solves the problem for you and shows how it was solved. It does everything from basic math to algebra.

Answer 8

Don't you people be doing his math homework...sweetie we had to get through this, now you must....ask your teacher for some help so that someone can actually explain what's going on so you can learn it too!

Answer 9

Very good, I see what your teacher is doing here.

The answer to all your questions is 2xy squared.

Answer 10

a couple is okay but ddddddaaaaaaaammnnnn!!!! you want us to give you answers to your whole work sheet...go to "webmath .com" ...not only will it give you the answers but it will show you how to do the problem.