Answer:
8
Step-by-step explanation:
3x is a varable and -1 is an integer
7a + 6c + 9a - 15c
-- Look for all the 'a's 7a, 9a
-- Addum up 16a
-- Look for all the 'c's 6c, -15c
-- Addum up -9c
-- Write the results 16a - 9c
Knowing the squareroot of 81 is 9, we can easily know that square root of 83 is close to 9.
9 to the closest tenth is 10.
Hope I helped :)
Set up a proportion.
3/6 = 5.5 / x Cross multiply
3x = 6*5.5
3x = 33 Divide by 3
x = 33/3
x = 11
The length of x is 11.
