Given: A(2,1), B(0,5), C(-1,2), AB and BC, mpab = 1/2, mpbc = -1/3, midpoint of AB = (1,3), midpoint pf BC = (-1/2, 7/2). Find standard form equation of line perpendicular to BC through the midpoint .
Use the formula m = y-y1/ x-x1

A. -x - 3y = 10
B. -x + 2y = 5
C. -x - 3y = -10

The function a represents the cost of manufacturing product a, in hundreds of dollars, and the function b represents the cost of manufacturing product b, in hundreds of dollars. a(t) = 5t + 2 b(t) = 7t - 2t +4 find the expression that describes the total cost of manufacturing both products, a(t) + b(t). a. 7t^2 - 7t + 2 b. 7t^2 + 3 +6 c. 7t^2 + 7t - 6 d. 7t^2 - 3t + 6

Witch represents the inverse of the function f(x)=1/4x-12

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?