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Answered

1. 7a ; a = 8
2.4x - y + 3z; x = 4, y = -9.2=2
3. 9(-72 + 3r) when z = 5 and r = 7
4. 3s2 + 2t : s= -4,t=3
5.
[tex]\frac{2 {a}^{2 } 3b}{4a+c}[/tex] ; a = 3, b = 4 and c = 2​

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Answer:

1. 56

2. 4(4) - (-9) +3(2) = 31

3.

4. 3(-4)²+2(3) = 54

5. 2⅐

Step-by-step explanation:

apply substitution

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