y=2x+7
y=2x-7
parallel lines always have the same slope but different y intercepts. y=2x+7 and y=2x-7 is the only possible answer because it's the only one with the same slope
Alrighty, so you said, simplify: 4t (2s - 7)
When there is a variable or number outside of the parenthesis, it means that it wants the whole thing multiplied by that number.
So, your right way to do this is:
4t (2s) + 4t (-7)
Simplify.
8st - 28t
So, the student incorrectly simplified them because she didn't multiply -7 by 4t like they should have.
~Hope I helped!~
Combine the "like terms" in <span>7p + 4 = – p + 9 + 2p + 3p:
7p + 4 = 4p + 9 Again, combine like terms, obtaining 3p = 5.
Solving for p, p = 5/3</span>
Answer:
17.5ml- of 10 percent solution, 17.5ml- of 20 percent solution
Step-by-step explanation:
35:100*15=5.25- ml of alkali in the base solution
Suppose we need x ml of 10 percents solution and 35-x - of 20 percents.
Then The quantity of alkali in the first one (10 percents) is x/100*10=0.1x
when in the second one we have (35-x)/100*20= 7-0.2x of alkali
0.1x+7-0.2x=5.25
7-0.1x= 5.25
0.1x=1.75
x=17.5- 0f 10 percents
35-17.5=17.5 - of 20 percents
