Math question show work for brainliest : )

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

The function models the number of accidents

Avery’s piggy bank has 300 nickels, 450 pennies, and 150 dimes. she randomly picks three coins. each time she picks a coin, she makes a note of it and puts it back into the piggy bank before picking the next coin.