The battery on mckenzie's old computer can last for 4 1/5 hours. she bought a new computer that has a battery that can last 40% longer. how long can the battery on mckenzie's new computer last?

Determine whether the quadrilateral below is a parallelogram. justify/explain your answer (this means back it up! give specific information that supports your decision. writing just "yes" or "no" will result in no credit.)

X+y=-4 x-y=2 use elimination with adding and subtraction

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.