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ohaa [14]
3 years ago
12

30 miles in 4 hours in simplest form

Mathematics
1 answer:
SIZIF [17.4K]3 years ago
3 0

Answer:

<u>15/2</u>

Step-by-step explanation:

  1. 30/4=7.5
  2. convert the decimal to a fraction
  3. 7.5 would give you 15/2 in fraction form
  4. since you can't simplify 15/2 anymore, <u>15/2</u> would be your answer.
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I need help on this lol
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Answer:

D is your answer.

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3 years ago
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Y=-4x +9 Identify the rate of change
ioda

Answer:

the rate of change is -4

Step-by-step explanation:

it's set up as y=mx+b

m is the rate of change

b is the y-intercept

m= -4

b=9

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3 years ago
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Help me please I lost
Travka [436]

Answer:

∠ WXY = 59°

Step-by-step explanation:

The sum of the 3 arcs in the circle = 360°, thus

arc WY = 360° - (156 + 86)° = 360° - 242° = 118°

The measure of the inscribed angle WXY is one half the measure of its intercepted arc, thus

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4 0
4 years ago
An appliance dealer's website features the mean life expectancy values for major household appliances. A standard refrigerator's
marshall27 [118]

Answer:

There is an 84% probability that your standard refrigerator will last between 12 and 20 years.

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

A standard refrigerator's mean life expectancy is 18 years with a standard deviation of 2 years. This means that \mu = 18, \sigma = 2.

What is the probability that your standard refrigerator will last between 12 and 20 years?

This probability is the pvalue of Z when X = 20 subtracted by the pvalue of Z when X = 12. So

X = 20

Z = \frac{X - \mu}{\sigma}

Z = \frac{20 - 18}{2}

Z = 1

Z = 1 has a pvalue of 0.8413

X = 12

Z = \frac{X - \mu}{\sigma}

Z = \frac{12- 18}{2}

Z = -3

Z = -3 has a pvalue of 0.0014

This means that there is a 0.8413-0.0014 = 0.8399 = 0.84 = 84% probability that your standard refrigerator will last between 12 and 20 years.

5 0
3 years ago
The vultures football team made the following gains on four plays :14 yards,-32 yards,3 yards,and -19 yards? What was the net ch
8090 [49]

The sum of gains is

... (14 yd) + (-32 yd) + (3 yd) + (-19 yd)

... = (14 +3 -19 -32) yd . . . . . . it is often convenient to rearrange the numbers to facilitate mental arithmetic

... = (-2 -32) yd

... = -34 yd

The net change of position was -34 yards.

6 0
3 years ago
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