Answer:
x=3, y=-1
Step-by-step explanation:
This is an algebra problem. We let x be the variable for the number of pounds of apples bought, and y be the number of pounds of bananas bought. From the descriptions, the formulas that we can formulate are:
y = 2x --> eqn 1
0.79x + 0.39y = 7.58 --> eqn 2
Substituting eqn 1 to eqn 2:
0.79x + 0.39(2x) = 7.58
Solving for x,
x = 4.828 pounds of apples
y = 2x = 2(4.828) = <em>9.656 pounds of bananas bought</em>
Answer: it’s Sara paid 3
Step-by-step explanation:
Answer:
![5c^2+2cd-2d^2-15](https://tex.z-dn.net/?f=5c%5E2%2B2cd-2d%5E2-15)
Step-by-step explanation:
To solve this problem, we must add up all the side values.
Our equation for the perimeter will look like:
![side1+side2+side3+side4=perimeter](https://tex.z-dn.net/?f=side1%2Bside2%2Bside3%2Bside4%3Dperimeter)
Now lets plug in our values for our sides and solve:
![4c^2+4cd+12+c^2-d^2+1+3cd+4d^2-30-5d^2-5cd+2=perimeter](https://tex.z-dn.net/?f=4c%5E2%2B4cd%2B12%2Bc%5E2-d%5E2%2B1%2B3cd%2B4d%5E2-30-5d%5E2-5cd%2B2%3Dperimeter)
Now lets combine like terms:
![5c^2+2cd-2d^2-15](https://tex.z-dn.net/?f=5c%5E2%2B2cd-2d%5E2-15)
So this is our perimeter!
Hope this helps! :3
Answer:
4
Step-by-step explanation:
20: 1, 2, 4, 5, 10, 20
8: 1, 2, 4, 8
Greatest common factor is 4!