Answer:
x=4
Step-by-step explanation:
21x+6+90=180
First, we need to subtract the numbers.
21x=180-90-6
21x=84
Now, we need to find the value for 1x, so divide the whole equation by 21
84/21
21/21
x=4
Hope this helps!
Answer:
I feel the answer is D (Sorry if this isn't the correct answer)
Answer:
Step-by-step explanation:
This is calculus, but I don't get fractions in the end. To maximize or minimize any function, you need to find the derivative of it, set it equal to 0, then solve for the critical values.
Our given equation is
x + y = 215 and we want to maximize the product, xy. Therefore,
y = 215 - x so its product in terms of x is
x(215-x) which is
. The derivative of this is
215 - 2x. Set it equal to 0 to maximize it.
215 - 2x = 0 so
-2x = -215 and
x = 107.5.
Sub this in to solve for y:
y + 107.5 = 215 and
y = 107.5
The product is 11556.25, not that you need it.
For the first part, we know that we start at 1500$. Next, we know that we have 100% of the 1500$ at the start. After that, it depreciates at 30%, so we have (100-30)%=70%, and 70/100=0.7, so it multiplies by 0.7 every year, and the answer is either the second or third one. For the second part, we know that we start at 1500 dollars - it cannot go higher than that, but it has to be that at the start (x=0, or no time has passed). Next, we subtract 300 for every year, so after x years, it has depreciated 300*x times. Therefore, for the amount of money it's worth, we have y=1500-300x and the answer is the third option
Feel free to ask any questions that come up!
