Express -4/-7 as a rational numbers with denominator.

1. -28
2. 7
3. 35

The sum of two numbers is 86, and their difference is 20. find the two numbers

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?