What is the y-intercept of the graph of the fuction f(x)=x^2+3x+5

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

From the top of a tree a bird looks down on a field mouse at an angle of depression of 50°. if the field mouse is 40 meters from the base of the tree, find the vertical distance from the ground to the bird's eyes.