∠a and ∠b are complementary angles. ∠a measures 28° What is the measure of ∠b? Step-by-step please I need this quick

Gregory draws a scale drawing of his room. the scale that he uses is 1 cm : 4 ft. on his drawing, the room is 3 centimeters long. which equation can be used to find the actual length of gregory's room?

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

How many grams the dog will eat in 3 days?