Street C is perpendicular to Street A and passes through (4, -6). Write this street's equation in point- slope form.
street a's equation was y= -2x +2

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)

The diameter of the moon is about 3500 km. approximate the surface area of the moon using the formula for the surface area of a sphere, s = 4? r^2. write your answer in scientific notation.

Lines a and b are perpendicular. if the slope of line a is 3, what is the slope of line b?