Trapezoid abcd has parallel sides ab and cd, of lengths a and b respectively. diagonals ac and bd intersect at e. draw the line through e that is parallel to ab and cd, and let p and q be its intersections with ad and bc respectively. (a) prove that e is the midpoint of p q. (b) show that p q = 1 1 2 1 a + 1 b . p q is known as the harmonic mean of a and b

step-by-step explanation:

the true statements are:

r = set of real numbers

n = set of natural numbers, 1,2,

w = n u{0} = {0,1,}

answer: you need the equation in the question so i can answer it

step-by-step explanation:

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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