If a=1/2h(b+c), what is the value of b when a=50,h=4,and c=11?

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

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)

Find the value of x. give reasons to justify your solutions! l, m ∈ kn