I need help with math?

Question

1. One positive number is 8 times another number. Their difference is 70. Find the number.
The number is______

2. 17 is equal to a certain number increased by twice 3. What is the number? the number is ____

3. A number plus 7 more than the number is 29. What is the number? the number is ________

4. If 9 is subtracted from two thirds of a number the result is 7. Find the number. The number is______

5. Seven times a number minus the number is 48. Find the number. The number is________

I DONT HAVE THE WHOLE LESSON ON HERE. THERE ARE 15 QUESTIONS AND I CHOSE 5 OF THEM.

Answer 1

I'll try to explain each one briefly but hopefully in a way that'll make sense.
First of all, anytime a question says "a number," it's a variable, so we'll call it x. Then when it talks about another number, try to express it in terms of x (so if it says a second number is 2 more than the first, call it x+2).
1) If the first positive number is x, let's say the second is 8x. If their difference is 70, and 8x is the bigger number because x is positive, we'll say 8x-x=70. Then solve algebraically by combining like terms to get 7x=70, and then dividing by 7 to get x=10. Since it asks for the number that is 8 times greater than the other, the answer to the question is 80.

2) Again, we'll call "a certain number" x. X increased by twice 3 means x+2(3), which it says is equal to 17. So, x+6=17, and solve by subtracting 6 from both sides to get 11.

3) The numbers here are x and x+7. If the sum is 29, x+x+7=29
then: 2x+7=29
2x=22
x=11

4) Two thirds of a number will be represented as 2x/3 (x times 2/3). So, 2x/3-9=7. To get rid of the fraction, we can multiply everything by 3 to get:
2x-27=21
2x=48
x=24

5) Seven times a number will be 7x, so when you subtract the number (x) you get 7x-x, or 6x. Then, 6x=48 and x=8.

Answer 2

Ok....
Translation:
is =
difference -

Write the MATH numbers UNDER the words
Seven times a number minus the number is 48. Find the number. The number is________
...7 X.....n - n = 48
7n - n = 48
THEN simplify your problem by combining what can be
7n - n = 48
6n = 48

THEN (the point in algebra is to get the letter alone)
THEN... whatever is beign done to teh letter (variable) you do the OPPOSITE
(so if its being +, you - OR if its being /, you X) AND YOU DO IT TO BOTH SIDES:
6n = 48
/6....../6
n...= 8

Answer 3

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Answer 4

Im sure this isnt the WHOLE homework assignment people, since its only 5 questions....maybe she just doesnt understand it...Ill do #5

7x - x = 48
7(8) - 8 = 48
do the parenthesis first
56 - 8 = 48
so the number is 8

Good luck hun!!

Answer 5

if you were asking for help you wouldn't put the entire assignment up....your looking for someone to do it for you....I will help you with one of them...
how about #3.
n+ (n+7) = 29
2n +7 = 29
2n = 29-7
2n = 22
n = 22/2
n = 11

Answer 6

You need a math tutor...
1)
X = 8y
X-Y = 70
8Y-Y = 70

Y = 10
X=80

THINK.

Then you should be able to do them all.

Answer 7

You're not asking for help. You want us to do your homework for you. There's a difference.