Determine the cost of boring if the cost is £45 for drilling the first metre, with an increase in cost of £5 per metre for succeeding metres.
1. A tensile test experiment conducted in the laboratory gave the following variations in readings: The first, tenth and the last terms of the readings follow an arithmetic progression of 9, 40.5 and 425.5 respectively. Find: The number of terms The sum of all the terms The 70th term in the AP. 2. An oil […]