What is the standard form of the number in the calculator’s display?

the calculator shows two point three e negative nine.

a.
0.23

b.
0.23

c.
2,300,000,000

d.
23,000,000,000

Identify the converse of the following conditional: if a point is in the first quadrant, then its coordinates are positive. if the coordinates of a point are not positive, then the point is not in the first quadrant. if the coordinates of a point are positive, then the point is in the first quadrant. if a point is in the first quadrant, then its coordinates are positive. if a point is not in the first quadrant, then the coordinates of the point are not positive.

An angle that measures between 90 and 180° is called a(,

Are the corresponding angles congruent? explain why or why not.