If the sin 90° is 1, then the cos °= (4 points)

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angles. measure need asap

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

At a kentucky friend chicken, a survey showed 2/3 of all people preferred skinless chicken over the regular chicken. if 2,400 people responded to the survey, how many people preferred regular chicken?