# Posts by Wren

Total # Posts: 4

**math**

He mows 6 lawns in one hour so you have to divide the number of lawns he mows in total by the number he can mow in one hour. Hopefully this helps. 21 / 6 = 3.5 hours

**Physics**

Question: A car goes down a ramp, and once it hits the floor it must travel 6 metres and then stop. Create the procedure in order to find the angle that the board must be to make this scenerio possible. You cannot test on both the floor and the board at the same time. Given/...

**Chemistry**

The pH of an acid solution is 5.90. Calculate the Ka for the monoprotic acid. The initial acid concentration is 0.10 M. What I have done: pH = 5.9 a = 10^-5.9 = 1.2589 * 10^-6 Ka = [H+][A-]/[HA] Ka = (1.2589*10^-6)^2/(.01-1.2589) I got -1.26903013E-12, but it's not ...

**Precalc**

Find a4 for the arithmetic series with s4=-36 and a1=9

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