In limts, we speak of the value of a function when it tends to a given number. As we say:
limx-->a f(x), we mean to say we are trying to find the value of f(x) as x tends to a number a.
But how close exactly is this? I mean how close to a should x be when we say x-->a. The value of x can be a + 0.0001 or it can be a + 0.000000001. So what should the value of x be as we say x tends to a?
(a) Form expressions using t and 4. Use not more than one number operation. Every expression must have t in it.
(b) Form expressions using y, 2 and 7. Every expression must have y in it. Use only two number operations. These should be different.