If 30% of x is 21, what is 80% of x?
(A) 28
(B) 35
(C) 42
(D) 48
(E) 56

One common system for computing a grade point average (gpa) assigns 4 points to an a, 3 points to a c, 1 point to a d, and 0 points to an f. what is the gpa of a student who gets an a in a 3 credit course, a b in each of two 2 credit courses, and a d in a 2 credit course?

Many colleges review students’ scores on the _ or _ before deciding whether to offer them admission.

Remote sensing of the earth's surface and atmosphere may involve the use of what type of instruments?