Math.Help?

Question

5. Simplify this expression: 13 + (- 12) - (-5) = ?
A. -6
B. -30
C. 6
D. 30

7. Solve this equation: y/9 + 5 = 0.
A. y = 45
B. y = 5
C. y = -45
D. y = -5
11. Given the formula K = LMN, what is the formula for M?
A. M = LN/K
B. M = LNK
C. M = KL/N
D. M = K/LN

If you could explain your answer Thank you

Answer 1

5) C, For this problem the negative sign in front of the the 12 changes the addition sign to a subtraction sign. Then when 2 negative signs are next to each other ( such as in front of the 5) they become a plus sign. From there you can do simple addition and subtraction.
7) C, To do this problem you must first subtract both sides by 5. This makes it y/9= -5. Then you multiply both sides by 9 which makes it y= -45
11) D, You must isolate M on one side so you divide LMN by LN, what you do to one side you have to do to the other side so you divide K by LN too. This gives you M=K/LN

Answer 2

question 5 is C.6.
the question = 13+(-12)-(-5)
= 1 + 5
= 6

question 7-A.45: y/9+5=0
y = -9*5
y = -45

question 11. K=LMN
D.M=K/LN

Answer 3

For #5: Infront of (-12) is an invisible 1. Multiply 1(-12). Infront of (-5) is an invisible -1. Multiply -1(-5). Your new equation is 13-12+5. Add and subtract from left to right. Your answer is 6.

For #7: Subtract 5 from both sides to get y/9 = -5. Multiply both sides by 9 to get y = -45.

For #11: Divide both sides by LN to get K/LN = M.

Answer 4

13+ (- 12 - (- 5) =

13 - 12 + 5 =

1 + 5 =

6

- - - - - - - - - - -

y/9 + 5 = 0

9(y/9) + 9(5) = 9(0)

y + 45 = 0

y + 45 - 45 = 0 - 45

y = - 45

- - - - - - - -

K = LMN

K / LN = LMN / LN

k / LN = M

- - - - - - - -s-

- - - - - - - - - -

Answer 5

5>>13-12+5= 18-12=6

7>>y/9=-5
y=-5*9= - 45

11>m=k/ln

Answer 6

5. simpifly the signs 13 -12 +5 = 1+5 = 6

7. y/9+5=0
subtract 5 from both sides and then multiply both sides by 9
y/9= - 5 y = -5*9 y = -45

11. divide both sides by LN to cancel it out giving you K/LN = M

Answer 7

This undertaking fairly has 2 solutions, reckoning on how progressed in math you're. in case you have not had extreme college geometry, you place it up like this: 8 inch pizza / 2 pupils = 2 * 12 inch pizzas / x pupils 8 / 2 = 24 / x 4 = 24/x 4x = 24 x = 24/4 x = 6 even nonetheless, it fairly is a bad answer. Pizza is (form of) a 2nd nutrition. PIzza serves human beings according to its section, not according to its circumference. in case you double the radius of a pizza, you multiply its section by way of 2*2, or 4, hence the bigger pizza serves 4 situations as many human beings. in case you improve the diameter of a pizza by way of 5 situations, you may serve 5*5=25 as many human beings. frequently, in case you mutliply the radius (or diameter) of a circle by way of n, you multiply the component of the circle by way of n^2. So, you in reality sq. all your 8's and 12's interior the share above: 8 * 8 / 2 = 2 * 12 * 12 / x sixty 4/2 = 288/x 32 = 288/x 32x = 288 x = 288/32 x = 9 You get extra human beings! it is via the fact on an identical time as the circumference will improve by way of 12/8=3/2, the section will improve by way of (3/2)^2 = 9/4.

Answer 8

5.c
13+(-12)-(-5)=13-12+5=6
7.c
y/9=-5
y=-45
11.d

Answer 9

Q5 ans= 6
Q7 ans= C

Answer 10

C C D