When I double my number and add eight I get my number plus twelve

A train leaves a train station at 1 p. m. it travels at an average rate of 60 mi/hr. a high-speed train leaves the same station an hour later. it travels at an average rate of 96 mi/hr.

If my salary increase by 25% each year, in 4 years, I will earn exactly twice as much as I do now

If six people come to a party and shake hands with each other. If each person shakes the hand of every other person, how many handshakes occur?

Two lines intersect to form a linear pair with equal measures. One angle has the measure 3x° and the other angle has the measure (8y - 70) °. Find the values of x and y.

What is the y-intercept for the equation 5x-2y=-4

The temperature dropped 13 degrees in in 7 hours. the final temperature was - 2 degrees. what was the starting temperature?

What expression is equivalent to 18c^8 d^9/9c^3 d^6

How do I find the missing numbers in this problem - 7 * _ 8 r3

The height of a ball is modeled by f (x) = - 16x^2 + 128x, where x is the number of seconds after the ball is hit. How long is the ball in the air?

What is the reference angle in degrees for 31π 6?