Check the picture below.
so, that'd be 20.24845673131658693325, and to the nearest tenth it'd then be 20.2
42 cakes in 7 days, that's 42/7= 6 cakes per day
6*5=30
4.(14-3) + 12
4.11 + 12
44 + 12
56
r is the x coordinate and s is the y coordinate. Positive slopes go from lower left to upper right, like going up stairs or up a hill. The line that goes through (r, s) that is positive is line B.
X = pens and y = pencils
4x + 7y = 13.25
y = 0.75
4x + 7(0.75) = 13.25
4x + 5.25 = 13.25
4x = 13.25 - 5.25
4x = 8
x = 8/4
x = 2 <===so each pen cost 2 bucks