What is the value of n in the equation –(2n + 4) + 6 = –9 + 4(2n + 1)?

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?