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Ber [7]
3 years ago
6

1. What is the mean change in the forecasted high temperatures over the next 7 days? Remember, this can be found by averaging th

e values in the Difference column for the high temperatures. Show your work and steps. If your answer is not an integer, explain what two integers your answer is between. 2. What is the mean change in the forecasted low temperatures over the next 7 days? Remember, this can be found by averaging the values in the Difference column for the low temperatures. If your answer is not an integer, explain what two integers your answer is between.

Mathematics
1 answer:
Schach [20]3 years ago
4 0

Answer:

The table is missing in the question. The table is provided below.

Step-by-step explanation:

1. In the table, it is given the difference of high temperature. They are :

-7, -7, 2, 5, -3, -2

Now adding the differences of high temperatures and taking out its average.

-7 + (-7) + 2 + 5 + (-3) + (-2)= -12

Average : $-\frac{12}{6}=-2$

Thus the answer is an integer.

2.  In the table, it is given the difference of high temperature. They are :

0, -3, -7, -1, 1, 0

Now adding the differences of high temperatures and taking out its average.

0 + (-3) + (-7 )+ (-1) + 1 + 0= -10

Average : $-\frac{10}{6} = -1.66$

Thus, the answer is not an integer. The answer lies between the integers -2 to -1.

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Alex was biking along a 48 mile trail. First half of the time he was biking twice as fast as the second half of the time. If he
nydimaria [60]

Answer:

The speed in the first part is 16 mph.

Step-by-step explanation:

The total distance is 48 miles. The total time is 4 hours.

In the second part of the trip, he was traveling at speed s for distance d for 2 hours.

In the first part of the trip he was traveling at twice the speed, or 2s, for distance 48 - d, for 2 hours.

speed = distance/time

distance = speed * time

First part of trip:

48 - d = 2s * 2

d + 4s = 48   Equation 1

Second part of the trip:

d = s * 2

d = 2s    Equation 2

Equations 1 and 2 form a system of equations in two unknowns, d and s.

d + 4s = 48

d = 2s

Substitute 2s for d in equation 1.

2s + 4s = 48

6s = 48

s = 8

The speed in the second part is 8 mph.

The speed in the first part is 2s = 2(8) = 16.

The speed in the first part is 16 mph.

Check:

d = 2s = 2(8) = 16

48 - d = 48 - 16 = 32

The second part is 16 miles. The first part is 32 miles.

16 miles at 8 mph takes 2 hours.

32 miles at 16 mph takes 2 hours.

2 hours + 2 hours = 4 hours.

Our answer is correct.

Answer: The speed in the first part is 16 mph.

7 0
3 years ago
You can solve the following proportion by cross multiplying. What will the equation be after you cross multiply? 3/9 = x/15
aksik [14]
 3         x
---- = -----
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so 9x = 45 (and x =5).
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