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! A variable doesn't have to be "x", it could be "y", "w" or any letter, name or symbol.
Answer:
Option 4
Step-by-step explanation:
=> 
Combining like terms
=> 
=> 
Check the hundredth position after the decimal point.
This = 7 so we add 1 to the tenth position so 7 becomes 7+1 = 8
Answer is 27.8 to nearest tenth
The correct answer would be B.
C^2=a^2+b^2 we are given the hypotenuse of 19 units and one leg of 8 units so:
19^2=8^2+b^2
361=64+b^2
b^2=297
b=√297
b≈17.2 to the nearest tenth
