Which expression can be used to find 12 percent of $98? a. 12×98b. 0.12×$98c. 1/12×$98 d. 1/0.12×$98

Can someone explain the elimination method to me for this problem?

Seymour is twice as old as cassandra. if 16 is added to cassandra’s age and 16 is subtracted from seymour’s age, their ages become equal. what are their present ages? show !

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