... (a) 13◦ 42 51 + 48◦ 22 17 (b) 37◦ 12 − 21 ◦ 17 25 13◦ 42 51 48◦ 22 17 (a) Problem Add 14◦ 53 and 37◦ 19 62 Adding: 1◦ 14◦ 53 37◦ 19 52 12 36◦ 11 3✚ ◦✚ 1✚ 28 ✚ 21 ◦ 17 25 (b) 1◦ 53 + 19 = 72 Since ... graph is: υ = 20 90e−t/ 12. 0 When time t = 25 ms, voltage υ = 20 90e 25 / 12. 0 = 26 0 V When the voltage is 30.0 volts, 30.0 = 20 90e−t/ 12. 0 , hence e−t/ 12. 0 = 30.0 20 90 and et/ 12. 0 = 20 90 = 69.67 30.0 ... value of p when q is 2. 0, and (iii) the value of q when p is 20 00 85 = 4. 722 2 18 and 0.55x = ln 4. 722 2 = 1.5 523 Hence x = 1.5 523 = 2. 82 0.55 Graphs with logarithmic scales 129 1000 1000 y t y...