In a vce external examination, 20% of the students failed physics, 15% of the students failed biology and 12% of the students failed both physics and biology. a student is selected at random. a) if she or he failed biology, what is the probability that she or he also failed physics? b) what is the probability that she or he failed physics or biology?

c

step-by-step explanation:

3.how is solving radical equations different than solving linear equations?

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

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step-by-step explanation: