2a - 1 < 6a + 7
bring all the a 's on one side and all the whole numbers on the other side.
2a - 6a < 7 + 1
-4a < 8
multiply everything by -1
4a > -8
a > -8/4
a > -2.
Hope you will understand.
Might help if you write the equation
According to the empirical rule, approximately 68% of data fall within 1 standard deviation of the mean.
The average value of a continuous function <em>f(x)</em> over an interval [<em>a</em>, <em>b</em>] is given by the integral,
Compute the integral for <em>f(x)</em> = <em>e</em> ⁻ˣ over [0, 3] :
