What is the answer to 5+5(x+4)≤20?

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?