Mark is solving the following system.
ſ x+y+z= 2
3x+2y+z=8
4x-y-7z = 16
(1)
(2)
(3)
step 1: he multiplies equation (1) by 7 and adds it to equation (3).
step 2: he multiplies equation (3) by 2 and adds it to equation (2).
gp
which statement explains mark's mistake?

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

16 more than the product of 5 and p