Certain answers only! There are 12 questions, hopefully it isn't difficult. Thank you in advance. :)

Factor the polynomial 4x4 – 20x2 – 3x2 + 15 by grouping. what is the resulting expression? (4x2 + 3)(x2 – 5) (4x2 – 3)(x2 – 5) (4x2 – 5)(x2 + 3) (4x2 + 5)(x2 – 3)

Why is studying fractions important

Ntriangle abc, m∠a = 35° and m∠b = 40°, and a=9. which equation should you solve to find b?