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3 years ago

Find each unit price. 5 used books for $9.45

Mathematics

1 answer:

Olegator [25]3 years ago

6 0

Answer:

$1.89 per used book

Step-by-step explanation:

Divide the total price ($9.45) by the amount of items (5) and you get the unit price of $1.89 per item

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A researcher wants to estimate the mean commute time of residents in Westchester County. The researcher samples 40 commuters and

Ksenya-84 [330]

Answer:

21.759

Step-by-step explanation:

Given that :

Mean (m) = 25

Standard deviation (s) = 12.5

Sample size (n) = 40

α = 90%

The confidence interval is obtained using the relation:

Mean ± Zcritical * s/sqrt(n)

Zcritical at 90% confidence interval = 1.64

25 ± 1.64 * (12.5/sqrt(40))

Lower boundary : 25 - 1.64(1.9764235) = 21.75866546

Upper boundary : 25 + 1.64(1.9764235) = 28.24133454

(21.759, 28.241)

Hence, lower bound of confidence interval is : 21.759

4 0

3 years ago

Two times the sum of a number and 8 is 20 what is the number

Andre45 [30]

Answer:

n=2

2(n+8)=20

2n+16=20

-16 -16

2 2

n= 2

There u go love

Step-by-step explanation:

7 0

2 years ago

Read 2 more answers

Quick guys, I need some help on this

worty [1.4K]

Answer:

I think c

(not sure though)

3 0

3 years ago

Consider this expression.

schepotkina [342]

Answer:

$9m^2 + 17m- 9$

Step-by-step explanation:

Given

$7m^2 + (2m - 1)(m + 9)$

Required:

Simplify

We start by opening the bracket

$7m^2 + (2m(m + 9) - 1(m + 9))$

$7m^2 + 2m^2 + 18m - m - 9$

Collect Like Terms

$9m^2 + 17m- 9$

Hence, the equivalent expression is $9m^2 + 17m- 9$

5 0

3 years ago

Help . pls LANAHJAGAHGHAA

Bond [772]

Answer:

2:3

Step-by-step explanation:

7 0

3 years ago