Ricardo lost 6 golfballs while playing yesterday. he bought a box of 12 golf balls, then lost 4 on the course today. he now has 18 golf balls. how many golf balls did ricardo have to begin with?

Ihonestly don’t understand this at all

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.

Ineed on this question me get the answer