HelpPls

Oh oops. I did the same thing but I forgot to find what t is... Thanks!

...

You have to get rid of the dollars signs and only copy and paste the latex part to the latex box thing.

Ok thanks for telling me.

So basically you just have to factor out the common factors on both the denominator or numberstor then cancel them out.

hope this helps!

For 3, I got 12/29. Please point out any mistakes I might have made. Thanks,

Oh right. Thanks.

Yep, there are others. I listed all of them out and got 12 too.

Um...15+2(30)=75, not 60...

The answer is 27

I don't understand the step \(0.99\cdot 100-0.98(100-x)=x\), why do you do this? Can you explain more? Thanks.

The answer is 40.

We know that the answer must be a multiple of 5 between 30 and 50. But it also said it is a multiple of 8, so it is 40.

First, we write this in to a equation: 2x+5=3(5-x)

2x+5=15-3x

-5 and 3x on both sides

5x=10

divide 5 on both sides

x=2

Hope that helps! 

Thank very much but your 8 solutions were different with the answer key... Can there be differernt 8 solutions?

Ok, thanks so much!!!

This is actually a very easy question.

Multiply -5x+10y=10 by -2 because we want something common with the first equation and negative because we want to eliminate it later.

We get 10x-20y=-20

Then we cross out the 20y

And we are left with: -9x=22 and 10x=-20

Then we add them(both sides) and get x=2

And then we substitute it in whichever equation you want to

-9x+20y=22

-9(2)+20y=22

-18+20y=22

Add 18 on both sides

20y=40

Then divide 20 on both sides

y=2

So we get x=2 and y=2!

Then you can substitute them back into both equations and check your work but I don't have time so bye. Hope that helps!!