Pls help me
This is due Tomorrow and i don't know any of this

Anewborn baby had about 26,000,000,000 cells. an adult has about 4.94 times 10 to the 13 power cells. how many times as many cells does an adult have than a newborn

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Your company withheld $4,463 from your paycheck for taxes. you received a $713 tax refund. select the best answer round to the nearest 100 to estimate how much you paid in taxes.