Answer:
question 4 ... x = -11
question 5.... x = -7
question 6... x = 12
question 7.... x = 10
Step-by-step explanation:
number 4
note : the total angle of a triangle is 180 degrees
hence solve this by creating an equation
x + 51 + 60 + 80 = 180
x = 180 - 80 -60-51
x = -11
number 5
note : the total angle of a triangle is 180 degrees
hence solve this by creating an equation
remember that a right angle is 90 degrees
45 + 52+x + 90 = 180
x = 180 - 90 -52 -45
x = -7
number 6
note : the total angle of a triangle is 180 degrees
hence you can solve this by creating an equation
53 + 39+ 4+7x = 180
now make x the subject of the equation
7x = 180 - 53 - 39 - 4
7x = 84
x = 84/7
x = 12
number 7
note : the total angle of a triangle is 180 degrees
hence solve this by creating an equation
6x - 5 + 5x + 75 = 180
now make x the subject of the equation
6x +5x = 180 - 75 + 5
11x = 110
x = 110/11
x= 10
