Which expression is equivalent to -9a – 10 – 6a + 7?

Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

What kinds of numbers make up the set of numbers called the real numbers? give examples when you explain a number type. there are a limited set of types of numbers, but an unlimited number of examples of these numbers.

Which expression is rational? 6. , square root two, square root 14, square root 49