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miskamm [114]
3 years ago
6

20. A fair coin is flipped three times. Find the expected number of heads.​

Mathematics
2 answers:
bagirrra123 [75]3 years ago
6 0

Answer:

3 times

Step-by-step explanation:

If you flip a coin, it has 2 sides. So half the number of outcomes will be heads.

german3 years ago
5 0

Answer: There would always be a 1/2 chance or a .5 chance that it would land on heads. There is no guarantee unless you tried this but even still, if others tried this they would surely get different answers.

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An office room is 12 ft by 10 ft with a door that is 30 inches wide. How many feet of baseboard are needed to go around the room
Lina20 [59]
Draw a diagram to illustrate the problem as shown below.
The length of baseboard needed is AB + BC + CD + DE + FE.
Note that 30 in = 30/12 ft = 2.5 ft.

Because of the door opening,
AB + EF = 12 - 2.5 = 9.5 ft
Also,
BC = DE = 10 ft
CD = 12 ft.

The amount of baseboard needed is
AB + BC + CD + DE + FE
= (AB + EF) + BC + CD + DE
= 9.5 + 10 + 12 + 10
= 41.5 ft

Answer:
41.5 feet of baseboard.

7 0
3 years ago
What's the expression for the given value of the variable. 3x+5 when x=5
Pepsi [2]

1) Let's evaluate that expression

3x+5

2) Since the value of x has been given, then let's plug that into the expression

3x+5

3(5) +5

15 +5

20

3) The answer is 20

8 0
1 year ago
You invest $12,000 at 3.8% annual interest compounded annually. How much will you have at the end of 5 years?
Serjik [45]

Answer:

The answer is 60,000.

Step-by-step explanation:

If you invest 12,000 at 3.8 annual interest.  Annual means yearly, so that's every year. 12,000 x 5 is 60,000 that's why the answer is 60,000. If the answer is incorrect or correct let me know. If it's correct, mark me as brainlest, give me a rating, or say thank you! Have A Great Day.

3 0
3 years ago
Please help answer and explanation im very confused.
Veseljchak [2.6K]

Answer:

1) 18m²

2) 25cm²

Step-by-step explanation:

1)

  • a = ½ × b × h
  • a = ½ × 9 × 4
  • a = ½ × 36
  • a = 18m²

2)

  • a = ½ × b × h
  • a = ½ × 10 × 5
  • a = 5 × 5
  • a = 25 cm²
6 0
2 years ago
What is y=2x^2-12x+16 in vertex form
Natasha2012 [34]

Answer:

y = 2(x-3)^2 - 2

Step-by-step explanation:

y = 2x^2 - 12x + 16

y = 2(x^2 - 6x + 8)

y = 2(x^2 - 6x +8 +1 -1) you "complete the square" by bringing the last term (8) up to "half of the middle co-efficient squared". Middle co-efficient is -6, half is -3, squared is 9. To get from 8 to 9 you must add 1 (+1), but if you add 1 you must subtract 1 (-1) so that you don't change the overall value of inside the bracket


y = 2(x^2 - 6x +9) - 2 (bring the -1 outside of the brackets)

y = 2(x-3)^2 - 2

3 0
3 years ago
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