Answer:
[-1;∞)
Step-by-step explanation:
The lowest number is always written on the left side in the interval notation. the interval notation uses parentheses for exclusive sets and brackets for inclusive sets. Let's say you have two numbers m & n and m<x<n, then to write in interval notation, you would write (m,n). If m ≥x ≥ n then, [n,m].
log₉(<em>x</em> - 7) + log₉(<em>x</em> - 7) = 1
2 log₉(<em>x</em> - 7) = 1
log₉(<em>x</em> - 7) = 1/2
Take the base-9 antilogarithm of both sides; in other words, make both sides powers of 9:
can also be written as √9 = 3, and , so the equation reduces to
<em>x</em> - 7 = 3
Solve for <em>x</em> :
<em>x</em> = 10
let the exterior angle be x
x=60°+80°(being one exterior angle is equal to two interior angle)
x°=140°
Answer:
g(g(x)) = 4x + 9
Step-by-step explanation:
To obtain g(g(x)) substitute x = g(x) into g(x) , that is
g(g(x))
= g(2x + 3)
= 2(2x + 3) + 3 ← distribute parenthesis
= 4x + 6 + 3 ← collect like terms
= 4x + 9
250 divided by 20 is 12.5
50 x 12.5 = 625
Each foot of the wall uses 12.5 bricks to build. 625 bricks would be used to build a 50 foot tall wall.