The phone lines to an airline ticket reservation system are occupied 40% of the time. assume that the events that the lines are occupied on successive calls are independent. (a) if 10 calls are placed, what is the probability that the lines are occupied for exactly 3 calls? (b) if 10 calls are placed, what is the probability that for at least 1 call the lines are not occupied? (c) a person makes 10 calls per day for 365 days in a row. for how many of those days do you expect that all 10 calls got through (i. e., that the lines were not busy for a single call)?

i can you with this sweetie!

step-by-step explanation:

d) by the cross product property, ab^2 = bc multiplied by ad

step-by-step explanation:

we are given

in the given triangle abc

angle a is 90° and segment ad is perpendicular to segment bc

we can see that

triangle(abc) and triangle(abd) are similar because they have common side and same angle (90 degree)

so, triangles(abc) and abd are similar

since, they are similar

so, the ratio of their sides must be equal

we get

now, we can cross multiply

and we get

so, this could be step to prove it

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204

i think it would be c

mark brainliest if im right

step-by-step explanation: