The ratio of the side lengths of a quadrilateral is 2:4:5:7 and it’s perimeter is 36 m. What is the length of the shortest side?

What is sin 7x/4 ? i need on this urgent trig

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Find the magnitude, correct to two decimal places, made by each of the following with positive direction of the x axis a) y= x the answer is 45° but i don’t know how