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stealth61 [152]
2 years ago
7

Bill and Joe leave their house at the same time heading in opposite directions. If Bill is driving three times faster than Joe a

nd it takes them three hours to be 120 miles apart, how fast is Bill driving?
Mathematics
1 answer:
Arisa [49]2 years ago
4 0

The problem statement gives you the relationship between their speeds, and it gives you information you can use to find their total speed. You solve this by finding the total speed, then the proportion of that belonging to Bill.

The total speed is (120 mi)/(3 h) = 40 mi/h.

The speed ratio is ...

... Bill : Joe = 3 : 1

so the speed ratio Bill : Total is ...

... 3 : (3+1) = 3:4.

Bill's speed is (3/4)×(40 mi/h) = 30 mi/h.

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A student wants to determine if pennies are really fair when flipped, meaning equally likely to land heads up or tails up. He fl
Verdich [7]

Answer:

For this case we want to determine  if pennies are really fair when flipped, meaning equally likely to land head up or tails, so then the correct system of hypothesis are:

Null hypothesis: p=0.5

Alternative hypothesis: p \neq 0.5

Step-by-step explanation:

Previous concepts

A hypothesis is defined as "a speculation or theory based on insufficient evidence that lends itself to further testing and experimentation. With further testing, a hypothesis can usually be proven true or false".  

The null hypothesis is defined as "a hypothesis that says there is no statistical significance between the two variables in the hypothesis. It is the hypothesis that the researcher is trying to disprove".  

The alternative hypothesis is "just the inverse, or opposite, of the null hypothesis. It is the hypothesis that researcher is trying to prove".  

Solution to the problem

For this case we want to determine  if pennies are really fair when flipped, meaning equally likely to land head up or tails, so then the correct system of hypothesis are:

Null hypothesis: p=0.5

Alternative hypothesis: p \neq 0.5

7 0
2 years ago
Which values represent the dependent variable? (2,3) (2,-2) (-4,-2) (-2,2) A. {–4, –2, 2} B. {–4, 2, 3} C. {–4, –2, 3} D. {–2, 2
igomit [66]

The dependent variable is the output of a function, which would be the Y value.


In the given set: (2,3) (2,-2) (-4,-2) (-2,2), the Y value is the 2nd number inside each pair of parenthesis.


The answer would be D. {–2, 2, 3}

6 0
2 years ago
What is the sum answer of (1/3)9³ =
Verdich [7]
\frac{1}{3}\cdot9^3=\frac{1}{3}\cdot9\cdot9\cdot9=\frac{9}{3}\cdot9\cdot9=3\cdot9\cdot9=27\cdot9=\boxed{243}
3 0
2 years ago
Read 2 more answers
On a rectangular soccer field, Sang is standing on the goal line 20 yards from the corner post. Jazmin is standing 99 yards from
Anna007 [38]
Okay, so Sang is standing 20 yards away from one corner, and Jazmin is standing 99 yards away from the same corner. If this is a rectangle (I like visuals, so I'll use them to explain), then:
               
                    99ft
      A  -------------------------  B
         |                              |
20 ft  |                              |
         |                              |
    C   --------------------------  D

The question is asking you to solve for the diagonal line between points C and B. If you imagine a line there, you actually have the rectangle split into two triangles. So if you have triangle ABC, side CB would be the longest line, or the hypotenuse. That means you can use the Pythagorean Theorem to solve the problem.

A^2 + B^2 = C^2
99^2 + 20^2 = C^2
9,801 + 400 = C^2
10,201 = C^2

Now you solve for the square root of 10,201 to get C.

sqr (10,201) = C
C = 101 yards

3 0
2 years ago
Pamela has4/5 pound of sunflower seeds if she gives 2/3 pound of sunflower seeds to the squirrels in her backyard what fraction
Assoli18 [71]
4/5-2/3= 12/15-10/15 (common denominator is 15)=2/15 pounds of seeds left
8 0
2 years ago
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