Answer:
H= 10
Step-by-step explanation:
Hypotenuse formula if you have the other 2 sides.

Essentially look at your formula sheets, Take notes on your assessment questions and you should be fine.
He practiced for 1 hour and 30 minutes
Answer:
254 cm² (to 3 s.f.)
Step-by-step explanation:
Area of shaded region
= area of large circle -area of smaller circle

Radius of large circle= 15cm
Radius of smaller circle= 12cm
Area of shaded region
= π(15²) -π(12²)
= 225π -144π
= 81π
= 81(3.14)
= 254.34
= 254 cm² (3 s.f.)