William bought pencil boxes for his art class. Each box costs $3.50. He gave $30 to the cashier and got $5.50 as change. How many pencil boxes did he buy? A. 3

B. 4

C. 7

D. 10

Help It's for benchmark testing so I need it now!! D:

Use the following statements to write a compound statement for the conjunction or disjunction. then find its truth value. p: an isosceles triangle has two congruent sides. q: a right angle measures 90° r: four points are always coplanar. s: a decagon has 12 sides. a) a right angle measures 90° or an isosceles triangle has two congruent sides; true. b) a right angle measures 90° and an isosceles triangle has two congruent sides; true. c) a right angle measures 90° and an isosceles triangle does not have two congruent sides; false. d) a right angle measures 90° or an isosceles triangle does not have two congruent sides; true.