Answer:
x=12
Step-by-step explanation:
The isosceles triangle consist of two right angle triangle of the same dimensions.
Let the unknown side of the right angle triangle=y
x=y+y
x=2y
Right angle triangle
c^2=a^2+b^2
c=10
a=8
b=y
c^2-a^2=b^2
10^2-8^2=y^2
100-64=y^2
36=y^2
y=√36
=6
y=6
Recall
Substitute the value of y into the equation
x=2(6)
=12
Therefore,
16 + 3n
a = 19 ; common difference = 22 - 19 = 3
a(n) = a + (n -1 ) *d
= 19 + (n-1)*3
= 19 + 3n - 3
= 16 + 3n
