If r=20.5 and s=34.2 find s round to the nearest tenth

option d

Step-by-step explanation:

Remember the identity:

The inverse of the tangent function is arctangent. You need to use this to calculate the angle "S":

Knowing that: you need to find the measure of the angle "S" , (which is the adjacent side) and (which is the opposite side), you can sustitute values into

Then, you get that the measure of "S" rounded to the nearest tenth is:

the polynomial is a perfect square trinomial of the form a^2-2ab+b^2:

option a. true

step-by-step explanation:

9x^2-12x+4

comparing with the form a^2-2ab+b^2

1.) a^2=9x^2

solving for a: square root both sides of the equation:

sqrt(a^2)=sqrt(9x^2)

a=sqrt(9) sqrt(x^2)

a=3x

2.) b^2=4

solving for b: square root both sides of the equation:

sqrt(b^2)=sqrt(4)

b=2

to be a perfet square trinomial 2ab must be equal to 12x. let's check:

2ab = 2 (3x) (2)

2ab = 12x

correct