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3 years ago

11

Two rectangles are the same one has a length of 11 cm and a width of 10 cm and the other has a width of 7 cm find the length of

the second rectangle round to the nearest tenth if necesssry.
A)5.8 cm
B)8.9 cm
C)6.4 cm
D)7.7 cm

1 answer:

ser-zykov [4K]3 years ago

8 0

Answer:

D) 7.7 cm

Step-by-step explanation:

L/W=11cm/10cm=x/7cm

cross multiply to find x

10x=77

divide 10 by both sides

x=7.7

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John is a pizza delivery driver. He makes $12.25 an hour. John has $100 in his bank account. He wants to purchase a flat screen

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Mark buys Apple stock for $100 and its value increases by a factor of 1.5 each week. Which equation represents the relationship

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Given:

Initial value of the stock = $100

Growth factor = 1.5 each week.

To find:

The equation that represents the relationship between the number of weeks past since purchase and the current value of the stock.

Solution:

Let V be the current value of the stock after t week.

The exponential growth model is:

$V=ab^t$

Where, a is the initial value of stock, b is the weekly growth factor, t is the number of weeks.

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3 years ago

Steve wants to know what the average ACT scores of students graduated from his high school is. He randomly selected 25 students

beks73 [17]

Answer:

[a]. sample is 25 randomly selected students

also population is all students

[b]. (20.0, 23.0)

[c]. (8.8, 24.2)

Step-by-step explanation:

here is a step by step process to solving this, i hope you find this helpful.

1). The population is all students who graduated from his school while the

sample is 25 randomly selected students from the email list

2). given alpha = 1-0.86=0.14

critical z value(two tailed) for 86% confidence level is:

z=normsinv(0.07) or normsinv(0.93)=1.476

Margin of error=1.476*(4.6/SQRT(20))=1.5

86% confidence interval for population mean

=21.5+/-1.5

=(20.0, 23.0)

3). if population standard deviation is not known,we will use t distribution.

df=20-1=19

t*=tinv(0.05,19)=2.093

Margin of error=2.093*(5.7/sqrt(20))=2.7

95% confidence interval for population mean

=21.5+/-2.7

=(18.8, 24.2)

cheers i hope this helps!!!!

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