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3 years ago

Please help! This is really confusing.

Mathematics

2 answers:

ioda3 years ago

8 0

39 meters in 3 minutes means 13 meters each minute and 26 meters in two minutes. Multiply by 1,000 to convert it into 26000 millimeters.

frutty [35]3 years ago

6 0

3 minutes=39 meters
2 minutes= x meters

3minutes 2minutes
_________ = ________
39meters x meters

Cross multiply
3x=78
divide both sides by 3
x=26

1m=1000mm
So 26*1000=26000mm

Answer=26000mm

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it cost $102.50 to repair a plasma tv. if you pay $15 for new parts and $25 per hour for labour, how much time did it take to re

Nana76 [90]

Subtract the part from the total:

102.50 - 15 = 87.50

Now divide the remainder by rate:

87.50 / 25 = 3.5 hours

7 0

3 years ago

Ava is 9 years old. Rose is 11 time as old as ava. How old is rose?

balu736 [363]

99 years old due to multiplying 9 x 11

7 0

3 years ago

Read 2 more answers

In a Gallup poll, 1025 randomly selected adults were surveyed and 29% of them said that they used the Internet for shopping at l

svetoff [14.1K]

Answer: (0.25,0.33)

Step-by-step explanation:

A 99% confidence interval for population proportion is given by:-

$\hat{p}\pm 2.576\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}$ , where $\hat{p}$ = sample proportion, $n$ = sample size.

Given: $n=1025, \hat{p}=0.29$

A 99% confidence interval estimate of the proportion of adults who use the Internet for shopping:

$0.29\pm 2.576\sqrt{\dfrac{0.29(1-0.29)}{1025}}\\\\=0.29\pm 2.576\sqrt{0.00020087804878}\\\\=0.29\pm2.576(0.01417)\\\\=0.29\pm0.03650192\\\\=(0.29-0.03650192,\ 0.29+0.03650192)\\\\=(0.25349808,\ 0.32650192)$

$\approx(0.25,\ 0.33)$

Thus, a 99% confidence interval estimate of the proportion of adults who use the Internet for shopping = (0.25,0.33)

5 0

3 years ago

A set of data with 750 numbers is normally

kifflom [539]

Answer:

510

Step-by-step explanation:

(0.68)750

shift decimal places

510.00

refine:510

6 0

3 years ago

What was the simple interest rate on a $8,000 Investment that was left in an account for 18 months and earned $360 in Interest?

Karolina [17]

I think it would be 8,228 I think if it is 8000 - 18+360 hopefully I am right

3 0

3 years ago