Marina volunteers at the salvation army. she has been tasked with buying non-perishable items for families that were displaced by a recent flood. she finds a company willing to sell her cans of food at a discounted price. in the system below x represents the number of small cans she purchased and y represents the number of large cans she purchased.
2.25x+4.75y=714.75
x+y=181

part a: how many cans did she purchase?
part b: what was the total amount marina spent on the purchase?
part c: how many small cans did marina purchase?
part d: how many large cans did marina purchase?
part e: how much does a small can cost?
part f: how much does a large can cost?

See below for each answer

Step-by-step explanation:

What we have to do here is solve the equation system:

2.25x+4.75y=714.75  [equaiton 1]

x+y=181 [equaiton 2]

For this, lets take equation 2 and try to get the value of x as a function of y. We do so by subtracting x in both sides:

x+y - y=181 - y

x = 181 -y [eqaution 1*]

Now, we can replace this value of x in equation 1, so we get an equation with only one unknown variable y:

2.25x+4.75y=714.75

2.25(181-y) + 4.75y = 407.25 - 2.25y + 4.75y = 407.25 + 2.5y = 714.75

Now, subtract 407.25 in both sides:

407.25 + 2.5y - 407.25 = 714.75 - 407.25

2.5 y = 307.5

Dividing both sides by 2.5:

2.5y/2.5 = 307.5/2.5

y = 123

Now, we can find x replacing y=123 in equation 1*:

x = 181 - 123 = 58

x = 58

So, we can answer questions A, B ans C:

A) to know how many she purchased we have to sum small cans (58) and large cans (y), which is given by equation 1: 181 cans.

B) Then equation 2 shows the total expenditure in cans, summing each can number by its respective price. The total expenditure is 714.75

C) The number of small cans is given by x: 58

D) The number of large cans is given by y: 123

E) The cost of small cans is given by the price, the number that multiplies the x in the expenditure equation (Equation 1): 2.25 costs a small can.

F) The cost of large cans is given by its price, the number that multiplies the y in the expenditure equation (Equation 2): 4.75 is the cost of large cans.

i leave the calculator work to you.

7. diameter 4 miles, circumference 4π miles

8. radius 0.2 miles, circumference 0.4π miles

[this is a bad problem because the actual radius of a car on the track is less than 0.2 miles so the answer is less than 0.4π miles]

9. radius 6 feet, circumference 12π feet

10. diameter 14 cm, circumference 14π cm

11. diameter 4.8 feet, circumference 4.8π feet

41*67/2=1373.5

step-by-step explanation:

i just used a calculator