Need help please find all three answers

Solve each quadratic equation by factoring and using the zero product property. 14x - 49 = x^2

The half-life of a certain material is 0.004 second. approximately how much of a 20-gram sample will be left after 0.016 second? a. 5 grams b. 16 grams c. 0.32 gram d. 1.25 grams

Caitlin had 402. in her bank account. she withdrew $15.each week to pay for swimming lesson. she now has $237.