5 (r - 11) = 2 (r - 4) - 6 Use the Distributive Property on both sides
5r - 55 = 2r - 8 - 6 Combine like terms (-8 and - 6)
5r - 55 = 2r - 14 Subtract 2r from both sides
3r - 55 = -14 Add 55 to both sides
3r = 41 Divide both sides by 3
r = 14
Answer:
- D. The water will be about 50°C. (54.8 (rounded up) is 50.)
- C. 23; the amount the temperature increases each minute.
Step-by-step explanation:
x = 6 (6 minutes)
5.3 x 6 + 23 = 54.8
5.3 x 6 = 31.8
31.8 + 23 = 54.48
2. C. 23: the amount of the temperature increased each minute.
Let me know if this helps!
The quadratic equation for an equation with double roots 9 is : 
-18x+81 = 0.
what is a Quadratic equation?
A quadratic equation is an Algebraic equation with the highest power of its variable as 2.
It can be solved by several methods : Factorization, completing the square and graphical methods.
Analysis
if 9 is the double root of the equation, it means x = 9 or x = 9
So (x-9)(x-9) are factors
Therefore,
(x-9)(x-9) = 0
- 9x-9x + 81 = 0
-18x+81 = 0
in conclusion, the quadratic equation of the double root 9 is: -18x+81 = 0
Learn more about Quadratic equations : brainly.com/question/1214333
#SPJ1
If you mean 
, then the derivative is
If you mean 
, we know from above that
which leaves the constant term, whose derivative is
and so
