Hey :)
x= -12
Use the distributive property to multiply −4 by 2x+13
−8x−52=3x+80
Subtract 3x from both sides
−8x−52−3x=80
Combine −8x and −3x to get −11x
−11x−52=80
Add 52 to both sides
−11x=80+52
Add 80 and 52 to get 132
−11x=132
Divide both sides by −11
x= 132/-11
Divide 132 by −11 to get −12
x=−12
Hope this helps :)
+2,+2,+2,-2,-2,-2,+2,+2,+2 etc
Answer:

Step-by-step explanation:
A tank contains 240 liters of fluid in which 20 grams of salt is dissolved.
- Volume of the tank = 240 liters
- Initial Amount of Salt in the tank, A(0)=20 grams
Brine containing 1 gram of salt per liter is then pumped into the tank at a rate of 6 L/min
(concentration of salt in inflow)(input rate of fluid)

(concentration of salt in outflow)(output rate of fluid)

Rate of change of the amount of salt in the tank:


We then solve the resulting differential equation by separation of variables.

Taking the integral of both sides

Recall that when t=0, A(t)=20 (our initial condition)

Answer:
-4x^2-x
Step-by-step explanation:
($9.20) 2 = $18.40 ...................