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Cerrena [4.2K]
3 years ago
14

An adult blinks about 450 times in 30 minutes. A 12 year old blinks about 150 times in 15 minutes. How many more times does an a

dult blink in 60 minutes that a 12-year-old?
Mathematics
1 answer:
kaheart [24]3 years ago
5 0

Answer:

300

Step-by-step explanation:

An adult blinks

450 in 30 minutes

900 in 60 minutes (multiply 2 on both sidds)

A 12-year-old blinks

150 times in 15 minutes

600 times in 60 minutes (multiply 4 on both sides)

Difference:

900 - 600 = 300.

An adult blinks 300 more times.

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The safety inspector in a large city wants to estimate the proportion of buildings in the city that are in violation of fire cod
storchak [24]

Answer:

Check Explanation.

Step-by-step explanation:

The sample will be a representative of the entire build us in the city.

For a sample size 35, 3 have fire code violations, hence, the proportion of houses with fire code violations = (3/35) = 0.0857 = 8.57 %

The uncertainty in the estimate is given in the form of standard error.

Standard error = √[(p(1-p)/n]

n = sample size = 35, p = 0.0857, 1 - p = 0.9143

Standard error of the sample = √(0.0857×0.9143/35) = 0.1616

In terms of the population, (0.1616/35) = 0.00462

Proportion of buildings with fire code violations = (8.57 ± 0.462) %

8 0
3 years ago
Answer this question please.​
grandymaker [24]

Answer:

x = 11

Step-by-step explanation:

We know that vertical angles (opposite angles when two lines cross), are equal.

2x - 6 = 6x - 50

4x = 44

x = 11

3 0
3 years ago
Josh is mixing together concrete to build a brick wall. He's made 6 gallons of concrete with a mixture of 50% water. The instruc
katrin2010 [14]

Answer:

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3 0
3 years ago
To which sets of numbers - 1/4 does<br> belong?
Afina-wow [57]

Where are the sets? I don't see any...

6 0
3 years ago
Apples cost four times as much as oranges per pound. Apples are $2.80 per pound. How much do oranges cost per pound? *
inessss [21]

Step-by-step explanation:

Apples cost four times as much as oranges per pound.

If the cost of orange =x

then, cost of apples =4x

But,

the costs of apples =2.80$

So,4x=2.80

\tt{ x=\dfrac{2.80}{4} } ⠀

\tt{ x=0.70\$ } ⠀

so,oranges costs for per pound =0.70$

8 0
3 years ago
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