Answer:
Step-by-step explanation:
-(10)^-2 = -1/ 10² = -1/ 100
10² - 1/10² =100 - (-1/100 ) = 100+ 1 /100 = 9999/100
20% as a decimal = 0.20 × 69.99=£14.00
69.99-14=55.99
2.5
45cm2