Tim estimates that it will cost $500,000 to send his daughter to college in 18 years. He currently has $100,000 to deposit in an account. What simple interest rate must his account have to reach a balance of $500,000 in 18 years?

you can first factor out the n to get n(1+5). we know that 1+5 is 6, so we just have 6n.

answer: 180 degrees clockwise

step-by-step explanation:

the difference of two squares is a special form that has a factorization worth memorizing.

a² - b² = (a - b)(a + b)

your equation can be factored as

x² - 16 = 0

(x - 4)(x + 4) = 0

the zero product rule tells you the solutions are the values of x that make these factors zero: x=4, x=-4.