From the given figures in the options , only cylinder and prism have two congruent parallel bases.
A cylinder is a solid figure which has the two congruent parallel bases i.e. circles.
A prism is a solid shape that has two parallel congruent sides which are called bases and they are joined by the lateral faces that are parallelograms.
Rest of other options do not have congruent parallel bases.
The segments joining the sides of the lateral faces, are parallel to each other, and the sides of the congruent polygons are parallel to each other are called as congruent parallel bases.
Among the given figures,
Cylinder and Prism have two congruent parallel bases.
In cylinders, the two congruent parallel bases are circles.
In Prism, there are right and oblique prisms. Right prisms have rectangular congruent parallel bases and oblique prisms have non rectangular congruent parallel bases.
Cone, Circle and Pyramid do not have two congruent parallel bases.
21) 3(2j-k)=108 It is asking you to set the equation equal to j distribute the 3 6j-3k=108 move k to the other side by adding on both sides 6j=108+3k divide everything by 6 j=18+0.5k
