21 people out of 36 watch top of the pops. what angle would show this on a pie chart

Ineed asap graph the system of equations 2x+y=5; 14+7y=35

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.