Step-by-step explanation:
If x = the amount of 12% and y = the amount of 20%, then x + y = 80
Since we need 80 grams of 15%, 80(.15) = 12.
We are given that .12x + .20y = 12.
We can solve the first equation for x or y. Let's do x.
x = 80 - y
.12(80 - y) + .20y = 12
9.6 - .12y + .20y = 12
.08y = 2.4
y = 30
x = 80 - 30 = 50
The perimeter is 2(length) + 2(width), so 2(x+5) + 2(x+4) = 42 m. In solving for x, you find 6. Plug 6 back into your length and width where x originally was, and you find your length to be 11m, and your width to be 10m. Hope this helps!
Answer:
D
Step-by-step explanation:
Frustrated that McClellan had again failed to destroy Lee's army
I would say age of a plant to its height is a function while the others are not.
Answer:
Step-by-step explanation:
x > 0
x has to be greater than 0 so any numbers that are negative are NOT good
Solution : ALL the numbers that are POSITIVE, EXCEPT 0