Question

1=0.76r-9-0.36r
`1 = 0.76r - 9 - 0.36r`

Answer 1

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1 = 0.76r - 9 - 0.36r

1 + 9 = 0.76r - 0.36r

Simplify like terms

10 = 0.4r

Solve for r

r = 10/0.4

r = 25

Result

r = 25

b)

`\begin{gathered} \text{ -5 = }(1)/(4)z\text{ - 20 + }(1)/(2)z \\ \text{ -5 + 20 = }(1)/(4)z\text{ + }(1)/(2)z \\ \text{ 15 = }\frac{1\text{ + 2}}{4}z \\ \text{ 15 = }(3)/(4)z \\ \text{ 15x4 = 3z} \\ \text{ 60 = 3z} \\ \text{ z = }(60)/(3) \\ \text{ z = 20} \end{gathered}`

Result

z = 20