Answer:

Step-by-step explanation:
The formula to calculate the surface area of a sphere is the following:

Where A is the area of the sphere and r is the radius of the sphere.
In this case we know that the diameter d of the sphere is:

The diameter is:
.
Thus

Then the surface area of the sphere is:

Answer:
about 10 times I hope it helps
Answer:
or 
Step-by-step explanation:
The question in English is
During the week 72 children will visit the park. For each child is prepared a rectangular box, in which to arrange what will be collected during the visit. Each box is 18 cm long and 12 cm wide. How long is the strip of cardboard that is used to make the edge of all boxes.
Let
x ----> the length of the box
y -----> the width of the box
we know that
The perimeter of the box is equal to

we have


step 1
Find the perimeter of one box


step 2
Find the perimeter of 72 box
Multiply the perimeter of one box by 72

Convert to meters
Divide by 100

H=henry's age
j=justin's age
h=10j
in 6 years (h+6 and j+6)
h+6=4(j+6)
the equations are
h=10j and
h+6=4(j+6)
C is answer