HELP PLEASE WILL AWARD BRAINLIEST

Below in bold.

Step-by-step explanation:

Tan ( - 5π/4)

= tan (-5π/ 4 + 2π)

= tan (3π/4)

= -1.

sec π/ 3

= 1 / cos π/3

= 1 / 0.5

= 2.

cos 31π/ 6

= cos  5 1/6 π

= cos (5 1/6 - 4) π  = 7π /6

= -√3/2.

pakistan's principal natural resources are arable land and water. about 25% of pakistan's agriculture accounts for about 21% [1] of gdp and employs about 43% of the labour force. in pakistan, the most agricultural province is punjab where wheat and cotton are the most grown.

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: