Answer:
Understand that statistics can be used to gain information about a population by examining a sample of the population; generalizations about a population from a sample are valid only if the sample is representative of that population. Understand that random sampling tends to produce representative samples and support valid inferences.
Step-by-step explanation:
Answer:
See below
Step-by-step explanation:
q = quarters value = .25 q
n = nickels = 4q value = .05 (4q)
summed = 12.60
<u>.25q + .05(4q) = 12.60 </u> <====== <u>can be used to solve the problem</u>
.45q = 12.60
<u>q = 28 quarters then nickels = 4q = 112 </u>
Answer:
20 apples, 32 pears
Step-by-step explanation:
Using a for number of apples and p for number of pears, you get a+p=52 (amount) and 0.4a+0.5p=24 (cost).
One way of solving simultaneous equations is using like terms and adding/subtracting them to remove a variable. There aren't any like terms here, but we can create some by multiplying terms.
Multiplying the second equation by 2 gives 0.8a+p=48, so that makes a like term.
Since the symbols are the same in front of the like term, we subtract the second term from the first one. This gives 0.2a=4.
Dividing by 0.2 gives a=20.
We can sub this into either equation to get the value of p.
a+p=52, so 20+p=52, meaning p=32.
**This content involves simultaneous equations, which you may want to revise. I'm always happy to help!
Answer:
For number two, nearest whole number is 13. nearest hundredth is 13.26. number three I don't see anything.
Step-by-step explanation:
Explanation: When rounding, u look at the right number and if
greater than 4, round up which is add one
if right number is 4 or less we take nothing. also we change all other numbers behind the left number to 0. so round to a whole number it would be 13. 2 is smaller than 5. Nearest hundredth is the same thing. we look at the hundredth place which is 6. We look to the right. it's 0. less than 5 we round down. so it would be 13.2600. Or 13.26
number 3 I don't see anything so I can't help out
Answer:
x=12, y=4
Step-by-step explanation:
All the sides are the same length.
3x+y = 40
4x-2y = 40
Eliminate y terms: divide second equation by 2 and add to first equation
2x-y = 20
3x+y = 40
---------------
5x = 60
x = 12
y = 40-3x = 4
