Answer:
380m²
Step-by-step explanation:
11²+π≈380m²
Hello! And thank you for your question!
First add 7 to both sides:
x/5 = 4 + 7
Then simplify 4 + 7:
x/5 = 11
After that, multiply both sides by 5
11 x 5 = x
Finally, Simplify 11 * 5:
x = 55
Final Answer:
x = 55
Answer:
30 ml of 45% salt solution and 20 ml of 30% salt solution.
Step-by-step explanation:
Let x be the amount of 45% salt solution and y be the amount of 30% salt solution
the two equation will be:
x+y=60 -- A
0.45x+0.3y=0.4(60) -- B
Solve by substitution
Rewrite Equation A
x+y=60
x=60-y --- C
Substitute C into B
0.45(60-y)+0.3y=24
27-0.45y+0.3y=24
-0.15y=-3
y=20
<u>Substitute</u> the y=20 into equation C
x=60-20
x=30
Therefore, there was 30 ml of 45% salt solution and 20 ml of 30% salt solution.
There are many solutions. Choose any 'x', and then choose 'y' which is greater than 7 and greater than the double of 'x'.
When writing the ordered pair, remember that 'x' comes first.
Some examples: (0,8), (1,10), (-3,9), etc.
You can interpret this graphically. The points that solve 'y>2x' are those above the line 'y=2x', and the solutions to 'y>7' are those above the line 'y=7' (which is an horizontal line). Hence the solution to the system of inequalities is the intersection of those two regions. Have a look at the illustration: