Asong has 28 beats in 4 seconds . at this rate ,how many beats are there in 30 seconds?

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

Astocks price gained 3% in april and 5% in may and then lost 4% in june and 1% in july during which month did the stocks price change the most