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kirill [66]
3 years ago
7

The formula, for distance traveled d is, where r is the average speed of the object and t is time traveled. If an object travels

75 meters in 30 seconds, what is it's speed?
Mathematics
1 answer:
Iteru [2.4K]3 years ago
5 0

Answer:

hopefully this is correct but 37.5m/s

Step-by-step explanation:

  • 1 minute =60 secs
  • 30 secs=1/2 min
  • so it will be 30/60 × 75(somewhat like cross multiplication)
  • btw r(speed)= distance(d) ÷ time (t)
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Jose is going for a walk. He takes 3 hours to walk 7.5 miles. what is his speed?
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In a class of 100 students, 25 have hardcover and 75 students have paperback textbooks. If you randomly choose 15 students in th
Gnom [1K]

Answer:

23.72% probability that 3 of them have hardcover texts.

Step-by-step explanation:

A probability is the number of desired outcomes divided by the number of total outcomes.

The order in which the students are chosen is not important. So we use the combinations formula to solve this question.

Combinations formula:

C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

If you randomly choose 15 students in this class, find the probability that 3 of them have hardcover texts.

Desired outcomes:

3 with hardcover texts, from a set of 25.

15-3 = 12 with paperback texts, from a set of 75. So

D = C_{25,3}*C_{75,12} = \frac{25!}{3!(22)!}*\frac{75!}{12!(63)!} = 6 \times 10^{16}

Total outcomes:

15 students from a set of 100. So

T = C_{100,15} = \frac{100!}{15!85!} = 2.53 \times 10^{17}

Probability:

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23.72% probability that 3 of them have hardcover texts.

7 0
3 years ago
Which of these statements is true for f(x) = (1/2)^x
Ann [662]
<h3>Answer:  D) The y intercept is (0,1)</h3>

This can be confirmed by plugging x = 0 into the function to find that...

y = (1/2)^x

y = (1/2)^0

y = 1

Recall that any nonzero value to the 0th power leads to 1. So we can say x^0 = 1 as long as x is not zero.

---------------

Extra info (optional section):

  • We can rule out choice A because negative x values work in the domain. For instance, if x = -1, then it leads to y = (1/2)^x = (1/2)^(-1) = 2. The negative exponent will apply the reciprocal operation to the base fraction.
  • Choice B can also be ruled out because the range is y > 0. Or you could note that it is possible to get positive y values smaller than 1/2. Try x = 2 and you'll see it leads to y = 1/4 which is not greater than 1/2.
  • Choice C is false as well. The function f(x) = (1/2)^x is decreasing throughout the domain. A graph visually would show this due to it going downhill when moving from left to right. A table of values is a non-visual way to see we have a decreasing function. The table would show that y decreases when x increases.
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