What substitution should be used to rewrite 4x4 – 21x2 + 20 = 0 as a quadratic equation?

Find the value of x for which the lines are parallel.

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

The point (-7, -24) is on the terminal ray of angle 0 which is in standard position. a student found the six trigonometric values for angle e. the student's answers are shown. which value(s) are incorrect? sin(8) cos(8) 24 tan(0) sin(0)=25 cos(0) -- tan(ⓡ) - - 24 csc(o)=2 sec(0) --25 cot(6) - za csc(o) sec(0) cot(0) done