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irina [24]
3 years ago
7

If 3 students averaged 68 on a test and 4 students averaged 75, what is the average of all 7 students

Mathematics
2 answers:
Andreas93 [3]3 years ago
8 0

Answer:  3 students

68 68 68

4 students

75 75 75 75

Answer: 71.5

insens350 [35]3 years ago
5 0

Answer:13

Step-by-step explanation:

i uave sjfjd

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A designer enlarged both the length and the width of a rectangular carpet by 60 percent. The new carpet was too large so the des
Snowcat [4.5K]

x= length, y=width

Both the length and width were increased by 60% so now they are:

1.6x and 1.6y

Then they were both reduced by 25% so now they are 75%(100-25) of their previous size so they are:

0.75(1.6x) and 0.75(1.6y)

Their area would be length * width so it would be:

0.75(1.6x) * 0.75(1.6y)

Simplified this would be:

1.2x * 1.2y

Simplified more it would be :

1.44xy which is also 144% of xy which is a 44% increase of the original area (xy)


So the answer is:

44%



5 0
3 years ago
2. The Martian Zoological Society has a unique display of the native monocephalous fauna:
german

Answer:

There are 12 pentapods and 8 Tripods, which in total add up to 84 feet.

Step-by-step explanation:

Given that both the Tripods and the Pentapods have, at least, 3 feet (the Pentapods have 5), and that in total between both groups they add 20 heads and 84 feet, the following logical reasoning can be made:

If there are 20 heads, there are 20 Martians in all. Each of them has, at least, 3 feet, with which in principle the 20 Martians would add up to a total of 60 feet (20 x 3). Therefore, there is a surplus of 24 feet (84 - 60).

If the Pentapods have 2 feet more than the Tripods, the number of Pentapods in the total Martians is determined by that difference. Thus, if there are 24 feet left, there are 12 Pentapods (24/2).

Therefore, in the group of Martians there are 12 pentapods (12 x 5 = 60) and 8 Tripods (8 x 3 = 24), which in total add up to 84 feet (60 + 24).

6 0
3 years ago
Need help ASAP thank you!!!!
VashaNatasha [74]

Answer:

65.97

Step-by-step explanation:

volume of a cone is pi(r)^2(h)/3

hope this helps

5 0
3 years ago
18 = 3b<br><br>solve for 3b (30 points)
patriot [66]

Answer:

b = 6

Step-by-step explanation:

18 = 3b

3b = 18

b = 18/3

<em><u>b = 6 </u></em>

6 0
3 years ago
Read 2 more answers
A car that travels 20 miles in 1/2 hour at constant speed is traveling at the same speed as a car that travels 30 miles in 3/4 h
Vsevolod [243]
It’s because 2/3 of 30 miles in 3/4 hours is the same as 20 miles in 1/2 hour.

Proof:

30/1x2/3
60/3 = 20

3/4x2/3
6/12 = 1/2

Brainliest my answer if this helped you out?


5 0
3 years ago
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