Four coins are flipped. what is the probability of the coins all landing heads up ?

   1/16

Step-by-step explanation:

The Probability of getting heads  out of the two options (head or tails)

P(h) = 1/2   = heads / total

Each coin flip is an independent event so we can multiply the probabilities

4 heads in a row = P(h)*P(h)*P(h)*P(h)

                                1/2 * 1/2 * 1/2* 1/2

                                 1/16

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

the final price would be 29.6925

step-by-step explanation:

39.59 minus 25% equals 29.6925