In triangle cat a=4 c=5 and cos t=1/8. what is the length of t

Three times the difference of federico’s age, and 4, increased by 7, is greater than 37. what are possible values of federico’s age?

The radical equation 2+√2x-3 = √x+7 has a solution set [x= a0} and an extraneous root x = a1.

Solve 2 - 3 cos x = 5 + 3 cos x for 0° ≤ x ≤ 180° a. 150° b. 30° c. 60° d. 120°