Answer:
A cross section is a surface or shape that is exposed by making a straight cut through something especially at right angles to an axis.
9514 1404 393
Answer:
c = 81
Step-by-step explanation:
The equation x² -c = 0 can be factored as ...
(x -√c)(x +√c) = 0
which has roots ±√c.
The roots are given as ±9, so we have ...
±9 = ±√c
c = (±9)² = 81
The value c = 81 makes the equation have ±9 as solutions.
The answer is 30
because (2)(10) + 10
20+10=30
the 10 came from the m!!
