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Alexus [3.1K]
3 years ago
11

Phil is riding his bike. He rides 21 miles in 2 hours, 31.5 miles in 3 hours, and 42 miles in 4 hours. Find the

Mathematics
1 answer:
gavmur [86]3 years ago
7 0

Answer:

hi

Step-by-step explanation:

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the lengths of the sides of a triangle are in the ratio of 5:3:4. The perimeter of the triangle is 156cm. Find the length of the
lisabon 2012 [21]
The longest side is 5/(5+3+4) = 5/12 of the perimeter, hence
  (5/12)*156 cm = 65 cm . . . . . the length of the longest side
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2 years ago
What is the explicit formula for this sequence? 5, 10, 20, 40 , 80, 160
8_murik_8 [283]

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Multiply by two. Formula could be x * 2

Step-by-step explanation:

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3 years ago
CAN SOMEONE PLEASE HELP ME WITH NUMBER 2
lyudmila [28]

Answer:

Step-by-step explanation:

It's B.

So the equation is x > -25. In word form, "The solution to this equation is greater than -25."

B begins at -25, and has a thick arrow pointing in the positive direction.

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3 years ago
if 368 teenagers in a population of 4,310 report that they have smoked at least one cigarette during the past year, to one decim
allochka39001 [22]
Divide the amount of teenagers that smoked by the total population:

368 \div 4310 = 0.0853

Multiply this decimal by 100 to convert into a percentage:

0.0853 \times 100 = 8.53

To round to the nearest decimal place, look at the hundredths value:

8.53
3 > 5
8.53 -> 8.5

8.5% of teenagers reported that they smoked at least one cigarette.
4 0
2 years ago
A random sample of 102 full-grown lobsters had a mean weight of 16 ounces and a standard deviation of 3.4 ounces. Construct a 98
pshichka [43]

Answer:

The best point estimate for a confidence interval estimating the population μ is 16 ounces.

The 98 percent confidence interval for the population mean μ is between 15.21 ounces and 16.79 ounces.

Step-by-step explanation:

We have the standard deviation for the sample, so we use the t-distribution to solve this question.

The best point estimate for a confidence interval estimating the population μ is

The sample mean, so 16 ounces.

T interval

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 102 - 1 = 101

98% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 101 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.98}{2} = 0.99. So we have T = 2.36

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 2.36\frac{3.4}{\sqrt{102}} = 0.79

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 16 - 0.79 = 15.21 ounces

The upper end of the interval is the sample mean added to M. So it is 16 + 0.79 = 16.79 ounces

The 98 percent confidence interval for the population mean μ is between 15.21 ounces and 16.79 ounces.

4 0
2 years ago
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