John bought some pens and pencils at book store. if 5 pens and 3 pencils cost $13 while 5 pencils and 3 pens cost $11 instead, find the cost of a pen.​

Given (1+cosx)/(sinx) + (sinx)/(1+cosx) =4, find a numerical value of one trigonometric function of x. a. tanx=2 b. sinx=2 c. tanx=1/2 d. sinx=1/2

Abag has more green balls than blue balls, and there is at least one blue ball. let bb represent the number of blue balls and let gg represent the number of green balls. let's compare the expressions 2b2b and b + gb+g. which statement is correct? choose 1

What is the shape of the height and weight distribution