Answer:
16.2
Step-by-step explanation:
4*2.8+5=
Answer:
y=5x+2/3
Step-by-step explanation:
if y is negative you put that first equaling -5x because you are subtracting -2/3
seeing as the y has to be positive in the equation therefore you must multiply the whole equation by a negative in order to get the y to be postitive.
Answer:
Tasha should mix 25 liters of 20% solution and 50 liters of 50%.
Step-by-step explanation:
Let x liters be the amount of 20% solution and y liters be the amount of 50% solution Tasha takes.
1. Tasha needs 75 liters of a 40% solution of alcohol. Then
x + y = 75
2. There are
liters of alcohol in x l of 20% solution
liters of alcohol in 50% solution
liters of alcohol in 75 liters of 40% solution
In total,
of alcohol that is 30 l, so
0.2x + 0.5y = 30
3. Solve the system of two equations:
![\left\{\begin{array}{l}x+y=75\\ \\0.2x+0.5y=30\end{array}\right.](https://tex.z-dn.net/?f=%5Cleft%5C%7B%5Cbegin%7Barray%7D%7Bl%7Dx%2By%3D75%5C%5C%20%5C%5C0.2x%2B0.5y%3D30%5Cend%7Barray%7D%5Cright.)
From the first equation:
![x=75-y](https://tex.z-dn.net/?f=x%3D75-y)
Substitute it into the second equation
![0.2(75-y)+0.5y=30\\ \\15-0.2y+0.5y=30\\ \\0.3y=30-15\\ \\0.3y=15\\ \\3y=150\\ \\y=50\\ \\x=75-50=25](https://tex.z-dn.net/?f=0.2%2875-y%29%2B0.5y%3D30%5C%5C%20%5C%5C15-0.2y%2B0.5y%3D30%5C%5C%20%5C%5C0.3y%3D30-15%5C%5C%20%5C%5C0.3y%3D15%5C%5C%20%5C%5C3y%3D150%5C%5C%20%5C%5Cy%3D50%5C%5C%20%5C%5Cx%3D75-50%3D25)
Tasha should mix 25 liters of 20% solution and 50 liters of 50%.
Less than 5. 78 of $5.00 is only 4.375. Sho she would still have a balance after purchasing the fabric.
Best of luck!
2.5 feet is half of 5 feet meaning we know that 2.5 feet is gonna be equal to half of two inches. So we need the answer that gives us one. 2/2.5 = 0.8 and 0.8/5 = 0.4. This means the answer is not A as it is too small. 5/2.5 = 2 and 2/2 = 1 meaning that it must be b. Therefore it cannot be c cause its already b.