What is the explicit formula for this sequence? 7, 2, -3, -8,...
A. an = -5+ (n - 117
B. an = 7+ (n - 115
C. an= -7 + (n - 1)(-5)
D. an = 7+ (n - 1)(-5)

Hiroaki wants to find 3 3/4 - 7/8 explain why he must rename 3 3/4 to do the subtraction.

Koji is installing a rectangular window in an office building. the window is 823 feet wide and 534 feet high. the formula for the area of a rectangle is a=bh. what is the area of the window? enter your answer as a mixed number in simplest form in the box. $$ ft2

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years