The last one is the answer(y,y-5,and y+7)
By switching the unknown (x) with the number and seeing if one side really equals the other.
For example, by solving the equation 8/2+3*4+2*X= 10+5*x, we will find that x is the number 2, or that number two is the solution to our equation. To check whether this is true, we have to switch the letter x in the equation with the number 2, so if the results on both sides are the same, our solution is correct.
In this case 8/2+3*4+2*2=10+5*2
Or 4+12+4=10+10
20=20
Which proves that the number 2 is really the solution to the equation.
Answer:
$0,90
Step-by-step explanation:

I am joyous to assist you anytime.
Answer:
C
Step-by-step explanation:
To solve this use the equation
given in the problem and the value y = 50. Substitute y = 50 then solve for x by factoring.

Find two numbers which multiply to -100 and also add to -15. The numbers are -20 and 5.
So the factored form is (x-20)(x+5) = 0.
Set each factor equal to 0 and solve.
(x-20) = 0 so x = 20.
(x+5)=0 so x = -5.
This means the temperature is 20 degrees C or -5 degrees C. Only 20 is an option. The solutions is C.
Easy..
let's take a view fractions and decimals and make a little example ourselves...
Let's use:

, 0.75,

, and 1
Keep it simple...
So, now let's plot those on a number line...it's fairly easy...
Just change those fractions into decimals to make them easier to manage...

and

Leaving you with: 0.25,0.75,0.50, and 1.
Now, plot..
0 | | | | | | | | | | | | | 1
(0.25) (0.50) (0.75) (1)
Easy. :D