Pls Explain how to do this.

Which of the following statements is true? a. sin 18° = cos 72° b. sin 55° = cos 55° с. sin 72° = cos 18° d. bоth a and c.

Find two numbers if their ratio is 4: 7 and their difference is 123.

Quick use technology to approximate the solution(s) to the system of equations to the nearest tenth of a unit. {f(x) = x - 6 / -x² + 8 {g(x) = i x i (dont know how to add an image) select all that apply. (-3.3, 3.3) (3.3, -3.3) (3, -3) (3, 3) (-3, -3) (can select multiple)