Adding Rational Numbers Find each sum.

1. 6 + (-6)
3. 5.31 + (-7.40)
5. 7 3/4 + (-8 1/2)
7. 6 2/5 + 4 3/10

Subtracting Rational Numbers
Find each difference.

9. -28 - -14
11. -16 - (-25)
13. -5 2/3 - (-2 1/3)
15. 2 2/3 - 7 1/3

Multiplying and Dividing Rational Numbers
Find each product or quotient

17. -3 x 7
19. -2/3 divided by 4

Using the Order of Operations
Simplify each expression

21. 8 x (-3) + 4
23. 1 divided by 2^2 - 0.54 + 1.26

25. 5 (3 x 5 - 4)
26. 1 - (1 - 5)^2 divided by (-8)

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

b

step-by-step explanation:

the equation of a line in point- slope form is

y - b = m(x - a)

where m is the slope and (a, b) a point on the line

calculate m using the slope formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (0, 4) and (x₂, y₂ ) = (3, - 5) ← 2 points on the line

m = = = - 3

with m = - 3 and (a, b) = (3, - 5), then

y - (- 5) = - 3(x - 3), that is

y + 5 = - 3(x - 3) → b