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3 years ago

What is the expanded form of this number?

Mathematics

1 answer:

creativ13 [48]3 years ago

7 0

Answer:

I think it's C

Step-by-step explanation:

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A sweater is on sale for 20% off the regular price. The sale price is $60 . What is the regular price of the sweater?On a 15 sca

kherson [118]

Sale price = $60
Discount = 20%
Regular price = $60/0.8 = $75

5 0

3 years ago

Because of heavy traffic, a bus took 30 minutes to cover a distance of 20 city blocks. How many minutes per city block did the b

aev [14]

a bus took 30 minutes-------------------------- to cover a distance of 20 city blocks

X minutes------------------------------------------------one (1) city block

I apply a rule of three

X=(1)*(30)/20=1.5

Therefore

the bus moved 1.5 minutes/block city

 

7 0

3 years ago

4. Is rap music more popular among young Indians than among young Asians? A sample survey compared 634 randomly chosen Indians a

bulgar [2K]

Answer:

H0 is accepted

there is no difference between the proportions of Indian and Asian young people who listen to rap music every day.

Step-by-step explanation:

Given a sample survey compared 634 randomly chosen Indians aged 15 to 25 with 567 randomly selected Asians in the same age group.

$p_{1} = \frac{368}{634} =0.580$

It found that 368 of the Indians and 130 Asians listened to rap music every day.

$p_{2} = \frac{130}{567} =0.229$

Null hypothesis H0: there is no difference between the proportions of Indian and Asian young people who listen to rap every day.

$p_{1} = p_{2}$

Alternative hypothesis:- $p_{1} \neq p_{2}$

Level of significance α = 0.05

The test of statistic

$z = \frac{p_{1} - p_{2}}{\sqrt{pq(\frac{1}{n_{1} }+\frac{1}{n_{2} }) } } }$

where $p = \frac{n_{1}p_{1} + n_{1}p_{2}}{n_{1}+n_{2}} = \frac{634(0.580)+567(0.229)}{634+567}$

p = 0.414

and q = 1-p = 1- 0.414 =0.586

$Z = \frac{0.580-0.229}{\sqrt{0.414(0.586)(\frac{1}{634} +\frac{1}{567} } } }$

on calculation , we get

z = 0.300 ><1.96 at 95 % level of significance

H0 is accepted

there is no difference between the proportions of Indian and Asian young people who listen to rap every day.

3 0

3 years ago

The physics department of a college has 8 male professors, 11 female professors, 16 male teaching assistants, and 6 female teach

Lera25 [3.4K]

To determine the probability that one or the other circumstances will occur, you will count the number of possible outcomes and divide it by all the possible outcomes.

#of female teaching assistants + # of male teaching assistants + # of female professors

6 + 16 + 11 = 33

Total = 41

33/41 = 80

There is a approximate 80% probability that one or the other will occur.

6 0

3 years ago

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Maria bought seven boxes. A week later half of all her boxes were destroyed in a fire. There are only 22 boxes left. With how ma

Sloan [31]

Answer:

22*2

=44

Step-by-step explanation:

7 0

3 years ago