Which shows the expression below in simplified form? (2.8 × 109) ÷ (7 × 103) a. 4 × 106 b. 4 × 104 c. 4 × 105 d. 4 × 107

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?

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

Solve each equation using the quadratic formula. find the exact solutions. 6n^2 + 4n - 11