If sin θ = 2 over 7 and tan θ > 0, what is the value of cos θ?

3 square root of 5 over 7

negative 3 square root of 5 over 7

3 square root of 5

negative 3 square root of 5

It's the first choice.

Step-by-step explanation:

cos θ  = √(1 - sin^2 θ ) and cos θ  will be positive because  sin θ > 0  tan θ > 0. The angle  θ  will be in the first quadrant.

cos  θ  = √( 1 - (2/7)^2)

cos  θ = √(1 - 4/49) = √(45/49)

cos  θ  = √9√5 / 7

cos  θ  = 3√5 / 7.

9987

step-by-step explanation:

the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies