Checking and securing understanding of changing the subject with simple algebraic fractions

12 questions

1. In which of these formulae is a the subject?
2. Make x the subject of 3x = y + z.
3. Make a the subject of 4-ab=c.
4. The solution to the equation {10\over x} = 2 is when x=___.
5. What is the solution to the equation {5\over x}=7?
6. You are given the formula w=2xy+3x^2. When x=3 and y = 4, w=___.
7. Make x the subject of y = 2\pi x.
8. Make h the subject of sin(\theta )={o\over h}.
9. Make a the subject of b=\frac{5}{a+c}.
10. Make r the subject of p = \sqrt {q\over r}+1.
11. A formula for calculating the perimeter of a rectangle is shown. When P= 16 and b = 5, the value of a is ___.
12. The formula for the area of a sector is shown. When the area, A, is 110 cm² and the radius, r, is 10 cm, the value of \theta is ___ to the nearest degree.

License: OGL