Why is a compound considered a pure substance why or why not

During a thunderstorm yesterday, 990 milimaters of rain fell in 55 minutes what is the unit rate for milimaters per minute?

Which expression are equivalent to 5*5*5*5*5*5?

Equivalent - 8.2 - - 5

Evaluate the given algebraic expression for x = 7 and y = 3. 2 (x + y) 2 A.) 20 B.) 42 C.) 200 D.) 400

For what values of x: Is the trinomial x2-11x+31 equal to 1? Are the values of the polynomials x2-5x-3 and 2x-5 equal? Is the binomial 7x+1 equal to the trinomial 3x2-2x+1? Is the trinomial - 2x2+5x+6 equal to the binomial 4x2+5x?

Daniel worked for 213 hours and earned $18.20. How much would he make if he worked for 514 hours?

Is 4 a solution of 2x = 8

Marta said 50 + 1/2m=120 is an equation, while Maribel argued that it is an expression. Determine who is correct and explain why.

What is the degree of the polynomial 2x3 - 3x2 + 4x + 5

Convert r^2 sin (2 theta) = 4 to Cartesian form.