Answer:
(-1;-3)
Step-by-step explanation:

Answer:
19x−47
Step-by-step explanation:
19x+−25+21+−43
You gotta combine the like terms
(19x)+(−25+21+−43)
19x+−47
Answer:
30"
Step-by-step explanation:
We know:
E = 3*s - 11
E = 79"
Setting them both equal:
79 = 3s - 11
add 11 to both sides
79 + 11 = 3s - 11 + 11
Simplify
90 = 3s
divide both sides by 3
90 / 3 = 3s / 3
Simplify
s = 30"
It is given in the question that in the lemon squash 2 parts concentrate is added to 5 parts of water. Thus it makes the concentrate to water ratio as 2:5 or
. Now, if this ratio is maintained then the amount of water to be added to 90 ml concentrate in a glass can be calculated as:

Where x is the amount of water to be added, in ml (milliliters).
Cross multiplication of the above equation will give us:

Dividing both sides by 2 we will get:

Thus, if we put 90ml of concentrate in a glass, the water that should be added must be 225 ml.
Answer:
The number of cars that brings the same profit is 9 and 0
Step-by-step explanation:
Given

Required
Determine the possible values of x

Subtract 5x from both sides


Factorize

Split the equation
or 
or 
<em>Hence, the number of cars that brings the same profit is 9 and 0</em>