What is the best estimate for the product of 289 and 7

Afurniture store is having a weekend sale and is offering a 20% discount on patio chairs and tables the sales tax on furniture is 6.25%

In cents, what is the least total amount that cannot be obtained by using a combination of fewer than eight coins from a collection of pennies, nickels, dimes and quarters?

What is the solution for the system of equations below? y=3/4x-12 and y=-4x-31. a: (-4,-15). b: (-4,-12). c: (4,-9). d: (4,-47)