Answer:
Hi there, I believe the answer to this equation is: 2.8
Step-by-step explanation:
Subtract 7 on both sides so
5n+7=21-7
you are left with 5n=14 you need to get n by itself so divide 5 on both sides.
5n/5 = 14/5
n=2.8
Hope this is correct :)
Have a great day
Answer: 680.4 square feet
Step-by-step explanation:
please mark brainiest
4t+2c=200
2t+7c=400
I will solve for c in terms of t first
4t+2c=200
2c=200-4t
c=100-2t
Then I will substitute this in for c in the second equation to make it single variable
2t+7c=400
2t+7(100-2t)=400
2t+700-14t=400
300t=12
t=25
Tables cost $25 each
Plug t back into one of the ORIGINAL equations to find the cost of chairs
4(25)+2c=200
100+2c=200
2c=100
c=50
Chairs cost $50 each
Hope this helps! :)
Answer:
Step-by-step explanation:
If a parabola has its vertex on the y-axis, then its equation is
This parabola passes through the point R(3,9), then
The area of the right triangle PQR is
Find PQ and QR, if 
Now,
We get two possible points 
and 
For point 
So,
For point 
So,
I just plugged all three of these equations into a calculator and A and C both equal 0.
Hope this helped.
