please help)Simplify: (r – 7)(r + 7)

r - 2

r2 + 12r - 49

r2 – 49

r2 - 2r – 49

Suppose that in 2008 , 840,800 citizens died of a certain disease assuming the population of teh country is 399 miliion, what is the mortality rate in units of deaths per 100,000 people?

Determine if the equation defines y as a function of x: 2xy = 1. yes o no

Given that sin∅ = 1/4, 0 < ∅ < π/2, what is the exact value of cos∅? a. (√4)/4 b. (√15)/4 c. (4π)/2 d. (4√2)/4