4(x+7)=8x-20
4x+28=8x-20
28=4x-20
48=4x
x=12
Answer:
1.-113
2.62
Step-by-step explanation:
1.-9^2+3(-9)-5
-81+-27-5
-113
2.5(7-(-9))+2(-9)
5*16-18
80-18
62
Answer:
(2) 2,640 ft
Step-by-step explanation:
I'm going to assume that in this question, you are walking 1 full circle around the reservoir. That would mean you need to calculate the circumference of the circular reservoir.
The circumference formula is:
C = ⫪d
C stands for Circumference
d stands for diameter
I will use 22/7 instead of pi, so the formula looks more like this:
C = (22/7)(d)
The diameter is 840 feet, so we will substitute the variable d with 840:
C = (22/7)(840)
You can plug this part into the calculator, but by hand, it'll look something like this:
(22/7)*840 = (22*840)/7
18,480/7 = 2.640
Hope it helps (●'◡'●)
Answer:
Step-by-step explanation:
<u>Use the area equation:</u>
<u>Substitute values:</u>
- A = 1/2* 1 2/3 * 1 = 1/2*5/3 = 5/6 km²
Answer: 
Step-by-step explanation:
The surface area of a rectangle can be calculated with:
The surface area of a trapezoid can be calculated with:
Calculate the area of the base, wich is a rectangle:
There are two equal rectangles, therefore, multiply the area of any of them by 2:
Calculate the area of the other rectangle:
There are two equal trapezoids, therefore, multiply the area of any of them by 2:
Therefore, the surface area will be the sum of all the areas calculated:
