The function j(x) = 39x represents the number of jumping jacks j(x) you can do in x minutes. how many jumping jacks can you do in 5 minutes? 7 jumping jacks 195 jumping jacks 234 jumping jacks 144 jumping jacks

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

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