Which expression can be used to find the area of triangle rst? (8 ∙ 4) - (10 + 12 + 16) (8 ∙ 4) - (10 + 12 + 16) (8 ∙ 4) - (5 + 6 + 8) (8 ∙ 4) - (5 - 6 - 8)

We start by drawing a rectangle around the triangle as shown in the diagram below Area of RST = Area of rectangle - (area of triangle A + area of triangle B + area of triangle C)Area of RST = (8×4) - [ (1/2×8×2) + (1/2×4×3) + (1/2×5×2) ] ⇒ we factorise the 1/2 out of the expression for the area of triangle A, B, and C Area of RST = (8×4) - 1/2 (16+12+10)

(8 ∙ 4) - 1/2 (10 + 12 + 16)  or A is the answer.

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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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step-by-step explanation: