Algebra review worksheet..Help please! I'm lost! D:?

Question

I need help with this please! i suck at math and at this point i hit a dead end to where i dont understand this stuff..Thank You!! Oh! and for number 3 all you have to do is show how to work it out.. :)

Question 1 (Multiple Choice Worth 1 points)

Choose the best possible answer.

In the problem 3(x-3) = 10, the first step in solving for x is to?

Distribute

Combine like terms

Cancel

Divide both sides by 3



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Question 2 (Multiple Choice Worth 1 points)

The formula to find the area of a triangle is: Area = 1/2 the base times the height or A = 1/2BH. If you know the area of a triangle = 60 sq ft and the base = 12 ft, what's the height?

A.) 5 ft.

B.) 10 ft.

C.) 72 ft

D.) 36 ft



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Question 3 (Essay Worth 1 points)

Solve for x.

x - (2x - 8) = 3x - 2(x + 5)






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Question 4 (Multiple Choice Worth 1 points)

In the perimeter formula P = 2L + 2W, the first step when solving for L would be to?

A.) divide both sides of the equation by 2W

B.) multiply both sides of the equation by 2

C.) add a negative 2W to both sides of the equation.

D.) add a negative 2L to both sides of the equation



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Question 5 (Multiple Choice Worth 1 points)

Solve for x.

x - 6= -3

x = 6

x = -6

x = 0

x = 3



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Question 6 (Multiple Choice Worth 1 points)

Choose the best possible answer.

In the problem (4/3)x = 12, the first step in solving this equation would be to?

A.) add a -4/3x to both sides of the equation

B.) divide both sides of the equation by 3

C.) combine like terms

D.) multiply both sides of the equation by 3/4



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Question 7 (Multiple Choice Worth 1 points)

If you weigh 200 lb force and have a mass of 5 lb mass, how much does your little sister weigh if she has a mass of 2.25 lb mass?

90 lbs

70 lbs

56 lbs

63 lbs



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Question 8 (Multiple Choice Worth 1 points)

Solve for x.

2(x + 6) - 4 = 2(x - 7) + 22

x = 8

x = 0

all real numbers

no solution



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Question 9 (Multiple Choice Worth 1 points)

Solve for x.

| 2x - 5 | + 5 = 12

no solutions

x = 6

x = 6 & -1

x = 6 & -6



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Question 10 (Multiple Choice Worth 1 points)

If you weigh 210 lb force and have a mass of 6.75 lb mass, how much does your little sister weigh if she has a mass of 2.25 lb mass?

A.) 93 lbs

B.) 70 lbs

C.) 56 lbs

D.) 63 lbs

Answer 1

1.) Distribute, b/c thats what you are supposed to do in the distributive property.



2.) 10, b/c x*12/2=60......10*12=120......120/2= 60



3.) x - (2x - 8) = 3x - 2(x + 5)

-x-8=3x-2x-10

-x-8=x-10

8=2x-10

18=2x

x=9 <----



4.) C?



5.) x - 6= -3

x= 3<----



6.) D.



7.) set up a proportion.... You can probably figure out what to do.



8.) 2(x + 6) - 4 = 2(x - 7) + 22

2x+12-4=2x-14+22

2x+8=2x+8

All real number<----



9.) | 2x - 5 | + 5 = 12

I 2x-5 I = 7

I2x I=12

x=6 and -6 <---



10.) set up a proportion... Same as number 7.



Hope my answers were correct and that I helped!

Answer 2

Qi : Distribute < http://mathforum.org/library/drmath/view/71616.html >



Q2 : Area of triangle --- 1/2 * b * h ---> 60 = 1/2 * 12 * h, so h (hight) = 10 ft.



Q3 : x - (2x - 8) = 3x - 2(x + 5)

x - 2x + 8 = 3x - 2x - 10

x - 2x - 3x + 2x = -10 - 8

-2x = - 18

use inverse operation

-2x / -2 = -18 / -2

x = 9



Q4 : C.) add a negative 2W to both sides of the equation. <----- inverse operation



Q5 ; x - 6= -3

use inverse operation

x -6 +6 = -3 +6

x = 3



Q6 : D.) multiply both sides of the equation by 3/4 <----- inverse operation



Q7 : 200 lbs force : 5 lbs mass = x lbs force : 2.25 lbs mass

200 * 2.25 = 5 * X

x = 90



Q8 : 2(x + 6) - 4 = 2(x - 7) + 22

2x + 12 -4 = 2x -14 +22

2x - 2x = -14 +22 -12 +4

0x = 0 --------> No Solution



Q9 : | 2x - 5 | + 5 = 12

case 1 :

2x -5 +5 = 12

2x = 12 , then x = 6



case 2 ;

- (2x - 5 ) + 5 = 12

-2x + 5 +5 = 12

-2x = 12 -10

x = 2 /( -2) , then x = -1

Final Answer : solutions are 6 and -1



Q10 : 210 lbs force : 6.75 lbs mass = x lb force : 2.25 lbs mass

6.75 * x = 210 * 2.25

x = 70 ----------> sister weigh 70 lbs

Answer 3

a million you're appropriate, y =14, varies at present (2,6) would be on a similar line (+4) as (10, 14) #2 gcf... you have 3 'factors' 51x^3y^2 -27xy 69y while i glance, i can ascertain that 3y is going into all of them, leaving... 17x^3y -9x 23 then I ask myself, can the rest bypass into all of them, the respond isn't any Writing all of them out seperately and clearly enables, all people had a y and everyon grew to become into divisible by skill of three GFC = 3y