Which equation can be used to find the length of a side in a right triangle with legs a and b and hypotenuse c? Choose all that apply. b=a2−c2−−−−−−√ a=b2−c2−−−−−−√ b=c2+a2−−−−−−√ a=c2−b2−−−−−−√ c=a2+b2−−−−−−√

2.2°  

step-by-step explanation:

let θ = the angle of elevation.

tanθ =77/2020

tanθ = 0.038 12

      θ = tan⁻¹0.038 12

      θ = 2.2°

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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step-by-step explanation: