Step-by-step explanation:
<u>Step 1: Find the angle a</u>
All triangles add up to 180 degrees
81 + 62 + a = 180
143 + a = 180
a = 180 - 143
a = 37
Answer: Option A, 37
To find the answer, put all your numbers in a triangle like so:
18
9 10
Then, you multiply 18 against every other number and then double it. (e.g. 18*9*2) after you do that to the nine and ten, multiply 9*10*2 and add all the products up. After you find the sum, divide it by 2.
All numbers means it will either be a > or < or =. So all numbers at least 3 units from -1. so -4 and below and 2+. So write it like this. I <-4, >2 I
162 - 9 = 153.
d = 153.
Diego is old.