Which formula is used to calculate the standard deviations of sample data

Which statement is true 1.the pythagorean theorem can be used to find the missing side of any triangle 2.the pythagorean theorem can be used to find the missing side of any polygon 3. the pythagorean theorem can be used to find the missing side of any right triangle 4.the pythagorean theorem can be used to find the missing side of any isosceles triangle

Which function is odd check all that apply a. y=sin x b. y=csc x c. y=cot x d. y=sec x

What is the value of x in the equation7x+2y=48 when y=3