How do you write ( 2 tens 1 one) x 10 in unit form

The area of square garden is 300m squared. how long is the diagonal?

The tile along the edge of a triangular community pool needs to be replaced? ?

Idon't want to fail summer school.the probabilities of contamination in medicine capsules due to the presence of heavy metals and different types of microbes are given in the table.the probability of capsule b having microbial contamination is (the same as, greater than, less than) the probability of capsule d having it.