Answer:
x=-58/15
Step-by-step explanation:
distribute first 10-2.5x+12=21-10x-28
Simplify(add the numbers) 22-2.5x=-7-10x
move the variable to the left side 22-2.5x+10x=-7
move the constant to the right side -2.5x+10x=-7-22
simplify like terms 7.5x=-29
divide by 7.5 x=-58/15
alternate forms are x=-3 13/15 or x=-3.86
% acid=[amount of acid / (amount of solution (acid + water))]*100
Data:
We have 5 gallons of a 20% acid solution:
amount of acid=20% of 5 gallons=(20/100)(5 gallons)=1 gallons
water amount=80% of 5 gallons=(80/100)(5 gallons)=4 gallons.
x=amount of pure acid (gallons).
(5+x)=amount of solution.
(1+x)=amount of acid in 50% solution
We have this equation:
50%=[(1+x) / (5+x)]*100%
(1+x)/(5+x)=50%/100%
(1+x)/(5+x)=1/2
2(1+x)=(5+x)
2+2x=5+x
2x-x=5-2
x=3
Answer: we need 3 gallons of pure acid.
Answer:
Kevin ran 4 miles and Steve ran 22
Step-by-step explanation:
kevin: 4
Steve: (22) but for now it's x
I dont really understand what Part A. is asking
26 - 4 = x (steve) | Part B.
x (steve) = 22 | Part C.
Kevin ran 4 miles and Steve ran 22 | Part D.
The answer for the blank space is 21.8
Y=-2x+12 is your equation and you are given a table with your x values in them so your first value is 0 so you would put the 0 where the x is so your equation would then look like this:
y=-2*0+12 —> y=0+12 —> y=12
so you would put that 12 in the first box. that gives you the points (0,12) on the graph and that’s where you would put your first dot…
you repeat this process for all the other x values
