Answer:
840
Step-by-step explanation:
im probably wrong
The first sentence → x - 2y = -1
the second one → 3x - 2y = -3
multiply the first one by -1
you can get → -x + 2y = 1
plus two sentences together
you can get → 2x = -2
so you are able to know that x = -1
and y = 0
The point (a,b) is (5,7) . Therefore, the equation of the line is y=7
20*5= 100
375+100=475
475/5= 95
Therefore the original price of a sweater is $95
Step-by-step explanation:
v=4/3*π*r^3
v=4/3*22/7*(1/2)^3
v=4/3*22/7*1/8
v=11/21
v=0.52 units^3
