Quantity eq.: d = n+9
quantity eq.: q = d+21
value equation: 5n + 10d + 25q = 1000

rearrange:
d = n+9
q = d+21 = n+9 + 21 = n+30
substitute to get:
5n + 10(n+9) + 25(n+30) = 1000
40n + 840 = 1000
does this look correct?
40n = 160
n = 4 (# of nickels)
d = 4+9 = 13 (# of dimes)
q = 4 + 30 = 34 (# of quarters)

step-by-step explanation:

first, eliminate the parenthesis:

3

x

+

2

−

4

x

second, group like terms:

3

x

−

4

x

+

2

third, combine like terms:

(

3

−

4

)

x

+

2

→

−

1

x

+

2

→

−

x

+

2

the one that has a slope of 1/2 and is positive.

step-by-step explanation: 2 buckets 1 trip ; 4 buckets 2 trips and so on.

answer:

your answer is: c. 196 7/8 in^3.

what graph

step-by-step explanation: