Two planes intersect in exactly one point.
a. always
b. sometimes
c. never

Option c - never

Step-by-step explanation:

Given : Two planes intersect in exactly one point.

Solution : Two planes never intersect in exactly one point.

Because, If two planes intersect, then their intersection is a line.

and a line consist of two points.

As shown in the figure attached.

There are two planes G and H and their intersection is a line l.

And the line l consist of two points.

Therefore, Option c is correct - Never

7

step-by-step explanation:

there are 70 more legs than eyes at the dog show (196 – 126 = 70). dogs have two more legs than eyes, and humans have the same number of legs as eyes. thus 70 is twice the number of dogs at the show, so the number of dogs is half of 70, which is 35. to get the number of humans, subtract 35 from 63: 63 – 35 = 28.

step-by-step explanation: