Ok but allow my humble self to use
instead of
.
We have,

If you wanna know what the inverse is swap the values of x and y,

And now solve for y,
.
Hope this helps.
A = 1/2 bh
A = 1/2 (21)(8)
A = 1/2 (168)
A = 84
Answer:A,D,E
Step-by-step explanation:
Just did the assignment
Step-by-step explanation: