Answer:
The cost for painting will be $212.
Step-by-step explanation:
I am painting the walls and ceiling of a rectangular 20 x 30 ft room. The walls are 10 feet tall.
So, the total area to be painted = {2 × (20 + 30) × 10} + (20 × 30) = 1600 sq. ft.
Now, a gallon of paint covers 400 square feet and cost $53 per gallon.
So, the number of gallons of paint required will be 
gallons.
And the cost for painting will be $(4 × 53) = $212. (Answer)
Answer:
-3
Step-by-step explanation:
Remember the following:
cos(x)=cos(x/2 + x/2) = cos(x/2)*cos(x/2) -sin(x/2)*sin(x/2)
cos(x)=cos2(x/2) - sin2(x/2)
We also know that sin2(a)+cos2(a)=1,
so sin2(x/2)=1 - cos2(x/2). obtained from previous step.
So, our first expression can be written as:
cos(x)=cos2(x/2)-1+cos2(x/2)
Where we obtain that: cos(x/2)= sqrt( 1+ cos(x))/ sqrt(2)
If we again use sin2(a)+cos2(a)=1, we will obtain the following relation:
sin(x/2)= sqrt(1-cos(x))/sqrt(2)
Next Tang(x/2)= sin(x/2) / cos(x/2)= sqrt(1-cos(x))/sqrt(1+cos(x))=
SQRT(9/1)=3
In the given range, cos(x), hence tan(x/2) is also negative
Answer:
5
Step-by-step explanation:
2x > 7 + 3
2x > 10
divide 10 by 2
x> 5
Answer:
0.12 grams of pepper
Step-by-step explanation:
0.52-0.4=0.12
Answer:
Use the slope formula.
Step-by-step explanation:
1. The slope formula is in the form of y2-y1/x2-x1.
2. Use one set of points as (x1, y1), and the other as (x2, y2).
3. Plug the points into the corresponding values of the slope formula.
4. Solve.
5. Your answer is -2/11.
