Which of the following represents the line of symmetry of the parabola represented by the equation x2 - 10x + 21 = 0?

A. x = 3

B. x = 2

C. x = 4

D. x = 5

F (x) = -x^2 + 4x+5 Find the vertex

Find a pair of numbers whose sum is 45 and whose difference is 11.

What is 100,000 less than five hundred sixty thousand, three hundred thirteen is

Write 0.39 as a percent

Employees in 2012 paid 4.2% of their gross wages towards social security (FICA taxes), while employers paid another 6.2% how much will someone earning $40,000 a year pays towards social security out of their gross wages

What is 39009909 times 339494

What is 13,507,804 in standerd form

You have $500 in a saving account that earns 3% simple interest per year. How much money will be in your account in 10 years

Janet has $120. If she saves $20 per week, in how many days will she have $500?

Bob is trying to decide between two cell phone plans. Plan A has no flat fee, but the user must pay 10 cents per minute on the phone. Plan B requires a one-time fee of $20, but only requires a payment of 5 cents per minute on the phone.