I need help with 53 × 1.2 ≈ And 2.1 × 82 ≈ _

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

Ihave trouble finding the nth term of a linear sequence

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.