If δabc is reflected over the x-axis and vertex b has coordinates (2, 7), what are the coordinates of vertex bʹ?

Is the power produced directly proportional to the wind speed, give reasons for your answer?

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.

Solve the formula ax+ by = c for x.