If two un biased coins are tossed simultaneously. find the probability of getting, two heads and at least one head.

Step-by-step explanation:

The way that we solve for combined probabilities is by multiplying the single probabilities together.

The probability of tossing a coin and getting heads = 1/2

1/2 x 1/2 = 1/4

This makes sense, since HH is only one outcome out of the 4 possible:

HH TT HT TH

The other probability, at least one head, based on counting the probabilities with heads in them is 3/4. Only the TT option has no heads.

c 1 hour

step-by-step explanation:

m = 2e

m = 2 so 2 = 2e

1 = e

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places