What is the value of the expression 7 - 5^2 x 3 - 4^3

Iq scores for adults age 20 to 34 years are normally distributed according to n(120, 20). in what range does the middle 68% of people in this group score on the test?

Adriver from the university of florida women’s swimming and diving team is competing in the in ncaa zone b championships

Math i have no idea how to do a and b