Which of the following is equivalent to 3a + 4b – (–6a – 3b) ?
a. 16ab
b. –3a + b
c. –3a + 7b
d. 9a + b
e. 9a + 7b

The gilbert's are designing a rectangular patio. the patio has an area of 24 square feet. the width of the patio is 3/4 it's length. what is the length of the patio

Jessica is a custodian at oracle arena.she waxes 20 m2 of the floor in 3/5 of an hour. jessica waxes the floor at a constant rate.at this rate how many sqaures meters can she wax per hour

Prove (a) cosh2(x) − sinh2(x) = 1 and (b) 1 − tanh 2(x) = sech 2(x). solution (a) cosh2(x) − sinh2(x) = ex + e−x 2 2 − 2 = e2x + 2 + e−2x 4 − = 4 = . (b) we start with the identity proved in part (a): cosh2(x) − sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 − sinh2(x) cosh2(x) = 1 or 1 − tanh 2(x) = .