The launder family has 4 children. Chris is 5 years younger than his brother Mark. Justin is half as old as his brother Chris. Mary, who is 10, is 3 years younger than Justin. How old is Mark?? Explain how you got your answer.

Mark is 31

Step-by-step explanation:

Mary is 10 ( 3 years younger than Justin) which means Justin is 13. Justin is half as old as his brother Chris which means Chris must be 26 ( since half of 26 is 13).  Chris is 5 years younger than his brother Mark. (26 +5 = 31)
Mark is 31.

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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