Answer:
1. 7x - 9y
x = -5 , y = 6
7(-5) - 9(6)
-35 - 54
2. 4/5(xz/y)
x = 8, y = 6, z = -4
4/5((8)(-4)/6)
4/5(-32/6)
-128/30 ÷ 2/2
3. 5/4πs³
s = 20 , π = 3.14
5/4(3.14)(20)³
5/4(3.14)(8000)
5/4 × 25,120
125,600/4 ÷ 4/4
4. 5a³ - 9b + 6c
a = -4 , b = 2 , c = 0
5(-4)³ - 9(2) + 6(0)
5(-64) - 18 + 0
-320 - 18 + 0
-338 + 0
5. x - ay + 22
x = 2 , a = -5 , y = 4
2 - (-5)(4) + 22
2 + 20 + 22
22 + 22
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Verified answer
Answer:
1. 7x - 9y
x = -5 , y = 6
7(-5) - 9(6)
-35 - 54
= -89
2. 4/5(xz/y)
x = 8, y = 6, z = -4
4/5((8)(-4)/6)
4/5(-32/6)
-128/30 ÷ 2/2
= -64/15 or -4 4/15
3. 5/4πs³
s = 20 , π = 3.14
5/4(3.14)(20)³
5/4(3.14)(8000)
5/4 × 25,120
125,600/4 ÷ 4/4
= 31,400
4. 5a³ - 9b + 6c
a = -4 , b = 2 , c = 0
5(-4)³ - 9(2) + 6(0)
5(-64) - 18 + 0
-320 - 18 + 0
-338 + 0
= -338
5. x - ay + 22
x = 2 , a = -5 , y = 4
2 - (-5)(4) + 22
2 + 20 + 22
22 + 22
= 44