book Maths Puzzle Numerical Ability

What is the prouduct of 2xK ?

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how do i simplify
22a[2]b[5]c[7]/-11abc[2] if all the numbers in the [] are exponents
Find the area of each circle with the given dimensions.

1. d = 5 ft

2. r = 26 cm

3. d = 4.2 m

4. r = 0.3 mm

5. d = 5 ft 1 in.

6. r = 1/5 mi

7. A dog is running