Find the Interest and total for these 3 question Will mark as brainliest if correct

Plz hurry due in 1 hour

Do u just plot the numbers on the graph like (1,

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Organic apples are on special for $1.50 per pound. does total cost vary inversely or directly with the number of pounds purchased? find the cost of 3.4 pounds of apples. a. inversely: $5.10 b. directly; $5.10 c. inversely: $2.27 d. directly; $2.27