A carpenter working on a very tall house stood on the middle step of a long ladder. To install a window, he went up 4 steps. To get a tool, he went down 6 steps. Then he went up 7 steps to work on the window again. Then he went up 7 more steps to work on the next level. Finally, he went up the 7 remaining steps to the top of the ladder, and stood on the roof of the house. How many steps does the ladder have?

answer: 80,000

step-by-step explanation:

the population doubles every day.

10,000*2=20,000 day 4

20,000*2=40,000 day 5

40,000*2=80,000 day 6

6 adults and 9 children went.

a + c = 15

12a + 9c = 153

12(6) + 9(9) = 153

72 + 81 = 153

363 square inches

step-by-step explanation:

surface area of a pyramid is b + 1/2ph

b is the area of the base: 11 x 11 = 121

p is the perimeter of the base: 11 + 11 + 11 + 11 = 44

h is the height of the pyramid: 11

121 + 1/2(44)(11)

121 + 242

363