How do you know that 8 over 10 and 48 over 60 are equivalent

Rewrite the following quadratic functions in intercept or factored form. show your work. f(t) = 20t^2 + 14t - 12

3x + 4y = 5 x- 3y = -7 solve by substitution

Aladder that is 20ft long is leaning against the side of a building. if the angle formed between the ladder and the ground is 75 degrees how far is the bottom of the from the base of the building?