Solve the system of equations using (a) substitution and (b) Elimination

-x-9y = 16

10x+20y=20

What is the avergage of the mass of beads in grams

How to calculate the area of a triangle with the hypotenuse as an arc?

What is [ (17 - 9) x (3 x 2) ] : 2? tell me your answer with the PBB or Parentheses, Brackets, Braces () [] {}

A young company expects to double their profits every year for the next ten years. If their profits were $5,000 this year, which expression represents their profits after ten years? 5,000 * 2 * 10 5,000 * 210 5,0002 * 10 5,00010

Is 36/9 a rational number

I have done a math equation for school and i forgot if i could leave a inproper fraction as my answer or if its a fraction i can reduce should i or should i not

Enter the value of n so that the expression (-y + 5) + (7y - 9) is equivalent to (ny - 4)

The heavyweight weight class in high school wrestling is from no less than 195lb and a maximum 285 LB write two inequalities to represent this range

A shose box measures 15in. by 7in. by 4 an half

Write the equation or inequality : in order to take honors level math, Lisa must have an average of 85 on her math tests. Her scores so far are 85, 70, and 98. What is the minimum score Lisa needs on the fourth test to get into honors math class?