Lisa is skateboarding at a speed of three miles per hour. A dog starts to chase her, and she
speeds up to seven miles per hour. What is her
change in speed in miles per hour?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

In the diagram, the ratios of two pairs of corresponding sides are equal to prove that almn - axyz by the sas similarity theorem, it also needs to be shown that x 6 z un z zz un = 2x zləzz lezy

Atorch and a battery cost 2.50 altogether.the torch costs 1.50 more than the battery.what fraction of the total price is the torch? give your answer in its simplest form.