can someone tell me what these are? 2a-5b=-19 3a+5b=9

What is the sum of the arithmetic series 18 t=1 (3t-4) a. 234 b. 441 c. 25.5 d. 49

How do i find out surface area a rectangular prism?

Solve the equation for x - 3x+7=-2

23) Does the following infinite geometric series diverge or converge? Explain. 1/7+1/28+1/112+1/448 + ... It diverges; it has a sum. It converges; it does not have a sum. It diverges; it does not have a sum. It converges; it has a sum.

Rose is responsible for planning the spring's carnival. She wants to know the number of students that would like for the spring carnival theme to be "Adventures in Space.

What is the converse of: "If it is snowing, then the temperature is below 32oF."

Linear equation: - 1 2 (6x + 10) = 13 Step 1: - 3x - 5 = 13 Step 2: - 3x = 18 Step 3: x = - 6 Which sequence describes the inverse operations used for steps 2 and 3 to solve the linear equation?

Absolute value of 4-8x is less than or equal to 20. Final equation?

What would be the rate of change in y=1/2+3?!

Leah has 3 fewer than 4 times as many DVD's as sonia has. leah has 37 dvds. how many dvds does sonia have?