Answer : 137.25
Step 1 - Convert the base of a triangle to decimal form
15 1/4 = 15.25
Step 2 - Multiply base by height
18 * 15.25 = 274.5
Step 3 - Divide 274.5 by 2
274.5 ÷ 2 = 137.25
Answer: 90% of the time.
Step-by-step explanation: This is because you can add the two different times and the standard time of 75 seconds, divide it all by 3 leaving you with 75.2 and that is 0.2 away from the original between those times all together. Take that 0.2 and subtract it from the 1.1 deviation and you’ll get 0.9 times that by 100 and you get it in a percentage; 90%.
