I just need help on B and C i think i got the answer but i wanna make sure

Solve the system of equations. y= 2x y= x^2 - 15

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1

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.