- How to write the equations for these a-3=-16 and a-6=-128. I found r, but idk how to find a-1.?

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Interesting math problem? Find the mean of each pair of numbers. Graph the numbers & the mean on a number line. a. 5 and 15
b. -5 and 15
c. -5 and -15
d. 137 and 441? What is the pH of a solution resulting from 2.50 mL of 0.075 M HCl being added to 35.00 mL of pure water? A ski lodge is constructed with one side along a vertical cliff such that it has a height of 15 m. determine an exact measure for the base? The hydronium ion concentration in an aqueous solution at 25 C is 6.1 × 10-2 M. What is the hydroxide ion concentration in this solution?