Why is it mathematically acceptable to add 2 linear equations together'?

Which one of the following groups of numbers includins all prime numbers? a) 2,3,5 b) 7,17,63,67 c) 3,11,63,67 d) 1,3,11,23

You purchase an item to sell in your store. The item costs you $6.45. You mark the item up 20%, but later run the item on sale at 5% off the marked price.

If two different planes intersect then they intersect at one and only one line true or false

The number of square units in the area of circle O is equal to 16 times the number of units in its circumference. Which of the following are diameters of circles that could fit completely inside circle O?

Christopher drew a scale drawing of a county park. He used the scale 7 inches = 1 yard. What scale factor does the drawing use? Simplify your answer and write it as a ratio, using a colon.

Which expression is equivalent to (5•3) - 4

A birthday cake was cut into equal pieces, and five pieces were eaten. The fraction 2/7 shows how many pieces are left. According to the fraction, how many pieces were not eaten A. 2 B. 7 C. 12 D. 5

What is the value of x: 5x + 4 = 2x + 22 How would you solve this question?

Solve the following equation by completing the square. 3x^2+x-1/12=0

Approximate the square root of 110 to the nearest hundreth