Simplify the exponent
-(7)^3

It costs 4.25 for 1 pound of roast beef. how much will it cost to purchase 2.5 pounds of roast beef? round to nearest cent

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year the population of her town is changing by a constant rate

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)