The velocity of an object over 12 seconds is shown on the graph below. Using 3 strips of equal width, estimate the distance the object travelled between 1 and 7 seconds.
Your answer should be a terminating decimal to 1 decimal place.

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.