Hey i need help on this question even if you can only answer one of the three boxes but if someone can do 2 or more that would be very apricated

thanks!

Students are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. there are 15 questions on the test, and students are given 51 minutes to take it.how many multiple-choice questions are on the test?

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?