There are 756,357,245 birds in the San Antonio Zoo. What is this number rounded to the nearest hundred thousand?

756,400,000.

Step-by-step explanation:

Rounding to the NEAREST hundred thousand in a 9-digit number will always be the first number in the middle. For this, the hundred thousand is 357,245.

When rounding to the nearest hundredth, you look at the tenths. If it is 5 and above, you round up. If it is 4 and below, you round down. In this case, it is 357. The tenth is the 5, so you round up. When you round up, that will cancel out all the numbers behind it. So the 357,245 turns into 400,000.

So your answer is 756,400,000.

Hope this isn't to late and I hope this helps your understanding of rounding!

you just switch the numbers basically so it would be 3/17

delaney would like to make a 5lb nut mixture that is 60% peanuts and 40% almonds.

she has several pounds of peanuts and several pounds of a mixture that is 20% peanuts and 80% almonds.

let 'p' represent the number of pounds of peanuts needed to make the new mixture, and  

let 'm' represent the number of pounds of the 80% almond-20% peanut mixture.

:

p + m = 5

therefore

m = (5-p)

write an equation based on the percent of peanuts

1p + .2m = .6(5)

replace m with (5-p)

p + .2(5-p) = .6(5)

p + 1 - .2p = 3

p - .2p = 3 - 1

.8p = 2

p = 2/.8

p = 2.5 lbs of peanuts required

then

5 - 2.5 = 2.5 lbs of the peanut/almond mixture required

:

a) what is the system that models this situation?

p + m = 5

1p + .2m = .6(5)