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Darina [25.2K]
3 years ago
14

There are three marbles in a bag. One is red and two are black. What is the probability of picking a black marble first, putting

it back in the bag and then picking a black marble?
Mathematics
1 answer:
Maru [420]3 years ago
6 0

Answer:

well for me I think

Step-by-step explanation:

2/3×2/3

4/9

since they are replacing the black marbles back

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Studies show that a typical giant hummingbird can flap its wings once in 0.08 of a second.
Licemer1 [7]

Answer:

a. 90

b. 360

Step-by-step explanation:

The time taken by humming bird to flap its wings= 0.08 sec

by flying 7.2 seconds a typical giant hummingbird flap its wings \frac{7.2}{0.08} times

= 90 times

Since, A ruby-throated hummingbird can flap its wings 4 times faster than a giant hummingbird, it will flap its wings in every 0.02 sec

so in 7.2 seconds it will flap \frac{7.2}{0.02} times = 360 times

4 0
3 years ago
A triangle has sides with lengths of 60 miles, 75 miles, and 45 miles. Is it a right triangle?
erastovalidia [21]

Answer:

I don't think it is

Step-by-step explanation:

tell me if I'm wrong

4 0
2 years ago
I need help with number 2
horrorfan [7]

Answer:

Slope= 0.20

Y-intercept=12.50

Equation= Y=0.20+12.50

Step-by-step explanation:

6 0
3 years ago
Kaylee's history class quiz scores for the current grading period are 10, 50, 75, 80, 82,
goldfiish [28.3K]
B is the answer I need the points
5 0
3 years ago
Need help on question 5 please help
blagie [28]

Answer:

  $66

Step-by-step explanation:

It can be convenient to assign a different variable to the amount of money each spent. We can call the amounts spent by Seedevi, Georgia, and Amy "s", "g", and "a", respectively.

The problem statement tells us ...

  s = (1/2)g

  s = a +6

  s + g + a = 258

__

The problem statement asks for the amount Seedevi spent, so we need to find the value of s. It is convenient to write the other variables in terms of s:

  g = 2s

  a = s -6

Then the sum is ...

  s + (2s) +(s -6) = 258

  4s = 264 . . . . . . . . . . . add 6, simplify

  s = 66 . . . . . . . . . . . . . .divide by 4

Seedevi spent $66.

4 0
3 years ago
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