Paper cannot be recycled if there are too many impurities present, like wrappers with food on them. The school’s recycling company requires the paper it picks up to be 98.5% clean. If the recycling company picked up 9,720 pounds of paper in all, what is the maximum weight in pounds of the impurities that could be on the paper?

145.8 pounds

Step-by-step explanation:

So, if there is 9720 pounds total, and 98.5% of it must be pure paper, than 1 - .985 is how much can be impurities.

1-.985 = .015 or 1.5%

Now lets multiply .015 times 9720

.015(9720) = 145.8

The maximum weight of impurities is 145.8 pounds

option c) graph of line going through 1, 4 and 3, 10

step-by-step explanation:

let y equal to margo's coin collection

let x equal to number of years

at the begining x=0, y=1 → point=(x,y)→point=(0,1)

she adds 3 coins per year, then y=1+3x

at x=1, y=1+3(1)=1+3→y=4→point=(x,y)→point=(1,4)

at x=3, y=1+3(3)=1+9→y=10→point=(x,y)→point=(3,10)

the graph of line going through (1, 4) and (3, 10), then the option c is the correct.

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92