1. Substitute the values given in the following formulae to find the value of the unknown variable:
V = d / t when d = 104 km and t = 4 hours P = 2l + 2w when l = 6 cm and w = 7 cm C = 2πr when π = 3.1 and r = 9 cm V = 1/3 (Ah) when A = 15 cm2 and h = 6 cm h = √(x2 + y2) when x = 6 m and y = 8 m
2. Make the variable shown in brackets, the subject of the following formulae:
| a |  |
(y) |
| b | p = 2(a + b) | (a) |
| c | x = (4 − y) / 2 | (y) |
| d | b = 5 − 10/r | (r) |
| e | v = 2as + u | (s) |
| f | A = πr2 | (r) |
| g | V = (4πr3)/3 | (r) |
3. Make x the subject of the following formulae:
|
a
|
y = 2x2 |
b
|
y = (x + 5)2 |
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c
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y = x2 − 6x + 9 |
d
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y = (x − 1)2 + 3 |
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e
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f
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g
|
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4. Make x the subject of the following formulae:
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a
|
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b
|
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c
|
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d
|
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e
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f
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g
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