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3 years ago

Solve please, Thanks.

Mathematics

2 answers:

nataly862011 [7]3 years ago

8 0

Answer:

i dont get it

Step-by-step explanation:

fiasKO [112]3 years ago

5 0

This is literally some college level work

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The total cost of four pens and seven mechanical pencils is $13.25. The cost of each pencil is 75 cents.

Harrizon [31]

Answer:

7 x 75 then 13.25 - 5.25

Step-by-step explanation:

do the math then thats the awnser

5 0

3 years ago

Shana bought sodas and popcorn for the movies. Sodas cost $3 each and popcorn cost $4 per bag. Shana bought 7 things from the co

erma4kov [3.2K]

Equation : 3s + 4p = $26
Answer : 2 sodas and 5 bags of popcorn.
The equation would be 3s + 4p = $26. 3s is the $3 for every soda and 4p is $4 for every bag of popcorn.
Shana bought 2 sodas and 5 bags of popcorn. 3 x 2 is 6 and 5 x 4 is 20 which would equal $26. They also equal to the 7 things because of the 2 sodas and 5 bags.

6 0

3 years ago

Chynna has one hour to bake muffins for the PTA bake sale. The muffins take 25 minutes to bake fully. Each pan holds one dozen m

BabaBlast [244]

Total time avalable = 1 hour = 60 minnutes.
Time for preheating the oven = minutes.

Time available for baking is 60 - 10 = 50 minutes.
This allows two sets of muffins to be baked (25 minutes for each bake).

Let p = number of muffins made.
p = (4 pans)*(12 muffns/pan)*(2 sets) =96 muffns

Answer: 96 muffins

3 0

3 years ago

In 5 years, Nicole will

olga55 [171]

Answer:

Nicole is 13 years old because x + 5 = 18

Step-by-step explanation:

7 0

3 years ago

A researcher takes a simple random sample of 83 homes in a city and finds that the mean square footage is 1628 with a standard d

Anna [14]

Answer: (1583.63, 1672.37)

Step-by-step explanation:

Given : Sample size : n= 83

Sample mean : $\overline{x}=1628$

Sample standard deviation : $\sigma=243$

The population standard deviation $(\sigma)$ is unknown .

The confidence interval for population mean :

$\overline{x}\pm t_{\alpha/2}\dfrac{s}{\sqrt{n}}$

For 90% confidence , significance level = $\alpha=1-0.90=0.10$

Using t-distribution table , Critical t-value = $t_{(\alpha/2, n-1)}=t_{0.05,82}=1.6636$

, where n-1 is the degree of freedom.

Now , 90% confidence interval for the mean square footage of all the homes in that city will be :-

$1628\pm (1.6636)\dfrac{243}{\sqrt{83}}\\\\ 1628\pm (1.6636)(26.672715)\\\\\\\\\approx1628\pm 44.37\\\\=(1628- 44.37,\ 1628+ 44.37)\\\\=(1583.63,\ 1672.37)$

Hence, the 90% confidence interval for the mean square footage of all the homes in that city = (1583.63, 1672.37)

7 0

3 years ago