**Answer:**

21) $90 22) $144 23) $240.5

**Step-by-step explanation:**

21) Cost to Store(CTS): 75 Markup(M): 20

Turn 20% into 0.20

Multiply the CTS, 75, by 0.20 to get 15

Add 15 and 75 together to get 90

22) CTS: 90 M:60

Turn 60% into 0.60

Multiply the CTS, 90, to 0.60 to get 54

Add 54 and 90 together to get 144

23) CTS: 130 M:85

Turn 85 into 0.85

Multiply the CTS, 130, to 0.85 to get 110.5

Add 110.5 and 130 together to get 240.5

**Answer:**

20. 13 cm

21. 12 cm

**Step-by-step explanation:**

20. isosceles means two sides are the same length, so you take the ten off the perimeter to get 26 remaining cm (36 -10) and you then divide that by two to get both sides of 13 cm (26 / 2)

21. because you know that if you split the triangle down the middle you get a right triangle and you can use a^2+b^2=c^2 to find the height, so we take the one side of 13 cm and half of the third side, which is 5, and you can find your answer (a^2 + 5^2 = 13^2 ---> a^2 + 25 = 169 ---> a^2 = 144 ---> a = 12)

**Answer:**

A

**Step-by-step explanation:**

I have attached a photo with working.

**Answer: y = -2**

<u>Step-by-step explanation:</u>

3(y - 2) = 2(y - 4)

3y - 6 = 2y - 8

<u>-2y </u> <u> -2y </u>

y - 6 = -8

<u> +6</u> <u> +6 </u>

y = -2