Will give brailyest what makes farming possible in Central Asia's dry climate?

a. annual floods.
b. irritation systems
c. seasonal droughts
d. tropical storms

Mr. walker gave his class the function f(x) = (x + 3)(x + 5). four students made a claim about the function. each student’s claim is below. jeremiah: the y-intercept is at (15, 0). lindsay: the x-intercepts are at (–3, 0) and (5, 0). stephen: the vertex is at (–4, –1). alexis: the midpoint between the x-intercepts is at (4, 0). which student’s claim about the function is correct?

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?