Step-by-step explanation:
a)

b)

Angle QRT is an exterior angle to the triangle. The rule is that the exterior angle of a triangle is equal to the sum of its remote interior angles. Those remote interior angles are angle RTS and angle TSR. So our equation is

. We can remove the parenthesis and simplify by combining like terms to get 9x = 5x + 9 + x and 9x = 6x + 9 and 3x = 9. That means that x = 3.
Answer:
Step-by-step explanation:
F(x)=4x-6
It will start at -6C and every hour we will be going up by 4
Answer:
m-9
-9+m
Step-by-step explanation:
m-9
The one way is the way it is given in the problem m minus nine
However it can also be written by interchanging the position of each term , but while interchanging we have to carry their sign along with them also.
Hence m can be taken on the left but with its + sign
and 9 can be taken in the right but with its sign that is -
Hence
m-9 can also be written as
-9+m