What is the sum of 8.4*10^8 and 4.2*10^7 written in scientific notation?

Evaluate the expression for the given value of the variable 7a - 4a for a =8

Labc is reflected across x = 1 and y = -3. what are the coordinates of the reflection image of a after both reflections?

Write an equation of the line that passes through the point (2, 3) and is perpendicular to the line x = -1. a) y = 1 b) y = 3 c) y = 0 eliminate d) y = -3