Math problems if someone can help with the first three

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).

21 type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar. the solution set of n2 - 14n = -45 is { (separate the solutions with a comma)

Two triangles can be formed with the given information. use the law of sines to solve the triangles. b = 49°, a = 16, b = 14