The sum of a whole number and its square is 90. find the number

-10 or 9

Step-by-step explanation:

Lets set it up like an equation

x + x^2 = 90

x^2 + x -90 = 0

Use abc-formula

to find x = -10 or 9

We put this into the original equation and find that both answers fit the equation

a. -0.3 > -0.33

hope it you

step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2