The aria of your triangle is (7*9)/2 = 31.5;
The letter "x" is often used in algebra to mean a value that is not yet known. It is called a "variable" or sometimes an "unknown". In x + 2 = 7, x is a variable, but we can work out its value if we try!
Answer:
A
Step-by-step explanation:
A, because it has two points which have the same x-value but different y-values, so it cannot be a function.
Now get the square root of 30
