The arithmetic mean (A) of two numbers (a and b) is given by the formula, and their geometric mean (G) is given by. Their harmonic mean (H) is given by the formula. Which formula correctly gives H in terms of a and b?

Iris had $900. She spend 22% of this amount on a mobile phone. How much did she pay for the mobile phone

What are the solutions to the following system of equations? y = x2 + 3x - 7 3x - y = - 2 (3, 11) and (-3, - 7) (11, 3) and (-3, - 7) (3, 11) and (-7, - 3) No real solutions

Is 5x-7y=2x-7 a linear equation?

100 pts You have a bag of 15 marbles: 5 blue, 3 red, 4 green, and 3 yellow. You draw 3 marbles without replacement. Which action, performed before the draws, increases the probability of drawing 3 green marbles in a row?

Select the measures that are equal. mark all that apply A. 6 feet B. 15 yards C. 45 feet D. 600 inches E 12 feet F. 540 inches

Farah rolls a fair dice and flips a fair coin. What is the probability of obtaining a 5 and a head?

If the cos = 6/10 & tan = 8/6 what is sin?

On a standard IQ test, the scores are normally distributed with a mean of 100 and a standard deviation of 20. a) If you score 140, in which percentile are you? b) If you score 90, in which percentile are you?

What is the smallest number? 32%, 0.2, 2/5, 55%

To solve the equation 2-5 (3+4x) = 2x+7,2-5 (3+4x) = 2x+7, Miranda's first step was to write 2-15-20x=2x+72-15-20x=2x+7. Which property did Miranda use in her first step?