Is `7 xx 5 xx 3 xx 2 + 3` a composite number? Justify your answer.

Why is 3 x 5 x 7 + 7a composite number?

7xx11xx13+13 is a composite number. Why ?

Explain why 7xx11 xx 13 + 13 and 7 xx 6xx 5 xx 4 xx 3 xx 2xx 1 +5 are composite numbers.

Say true or false and justify your answer: 2^3>5^2

Let f be the subset of Z xx Z defined by f={(ab,a+b) : a,b in Z} . Is f a function from Z to Z? Justify your answer.

Say true or false and justify your answer: 2^3xx3^2=6^5

How will you show that (17xx11xx2)+(17xx11xx5) is a composite number? Explain.

Is (i) log 2 rational or irrational? Justify your answer. (ii) log 100 rational or irrational? Justify your answer.

Explain why (7 times 11 times 13)+13 " and " (7 times 6 times 5 times 4 times 3 times 2 times 1)+5 are composite numbers.

Can there be a time-temperature graph as follows?Justify your answer.