Hassan predicted that he would sell 178 postcards. He actually sold 142 postcards. What are the values of a and b in the table below?
Percent Error

Option D) a = 36, b = 36

Step-by-step explanation:

We are told in the question that Hassan predicted that he would sell 178 postcards. He actually sold 142 postcards.

In the diagram above,

a = Error

b = Absolute Error

Error in mathematics is calculated as:

Approximately or Predicted value - Actual value

For Hassan,

His predicted value = 178

Actual value of postcards sold = 142

Error = 178 - 142 = 36

Likewise, the formula for Absolute error Absolute Error = |Actual Value - Measured or predicted Value|

It is important to noted that Absolute Error is always positive

Actual value = 142

Predicted value = 178

Absolute Error = |142 -178|

= |-36|

Absolute Error is 36

Therefore, Option D) a = 36, b = 36 is the correct option.

6 hours 48 min

step-by-step explanation:

68÷5=13.6

13.6×30=408min=6 hours 48 min.

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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°