Across section is the intersection of which two elements?
a.) a solid and a lineb.) a solid and a planec.) a plane and a planed.) a plane and a line

Option b is correct that is a solid and a plane.

Step-by-step explanation:

The  cross section means when two three dimensional intersects and gives the two dimensional figure.

Option a:

A solid and a line is not correct because line is not a three dimensional figure.

Option b:

A solid and a plane is correct because both of them are three dimensional figures for example:

If a plane cuts a sphere it will give circle which is a two dimensional figure.

Option c:

A plane and a plane when intersects gives a line which is not a two dimensional figure.

Hence, incorrect.

Option d:

A plane and line is not correct because line is not a three dimensional figure.

answer: i think it's a

step-by-step explanation:

13

step-by-step explanation:

169-1=168

168-3=165

165-5=160

160-7=153

153-9=144

144-11=133

133-13=120

120-15=105

105-17=88

88-19=69

69-21=48

48-23=25

25-25=0

since it took 13times to completely subtract it hence its square root is 13