A park ranger uses two drones to observe wildlife. After letting the drones hover at the same height for a while, she decreases the height of the first drone by 3834feet in order to take pictures. She also decreases the height of the second drone, but only by 20% of the decrease in height of the first drone. Which THREE methods could be used to find the change in height, in feet, of the second drone?AMultiply −3834by 15.BMultiply −38.75 by 0.2.CMultiply −38 by 0.2. Then add 0.75.DMultiply −3834 by 110. Then multiply by 12.EMultiply −38 by 15. Then multiply −34 by 15. Add the products.

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

the answer is  

a.

28 ft2

step-by-step explanation:

there is only one way to arrange all the eight relative to each other because they are not distinct. we have

now there are nine places to place an (and not more than one in one place).   because we have four symbols, we need to choose four of these nine places to insert an . order does not matter because the are not distinct.

thus there are 1 · c(9,4) ways, or, if we calculate it,

thus there are 126 ways to form such "words."