9.
Well the first has the angles being 3x+12,x,and 90 so they have to add up to 180 degrees because it is a triangle.
3x+12+x+90 = 4x+102 = 180 solve
4x+102=180
4x=78
x=19.5
Answer:
4.92
Step-by-step explanation:
9/10=180/x
x=200
8/10=180/x
(180*10)/8
(180*5)/4
x= 225
225-200=25
Answer: 25
I THINK
Answer: Cal's answer must be incorrect because the sum of angles is incorrect.
Step-by-step explanation:
The sum of all interior angles of a triangle is 180 degrees.
According to Cal, the three angles of the triangle has magnitude 65, 45 and 60 respectively.
Sum of angles = 65+45+60
i.e. Sum of angles = 170 which is not equal to 180
Hence, Cal's answer must be incorrect because the sum of angles is incorrect.
class a - a class with 3 boys and 7 girls because im assuming the total of students is 10 and it says girls (7) to total (10) so 10 - 7 equals 3 so thats the number of boys