PRETTY PLEASE HELP!! A mathematics software company claimed that their software could increase student performance in Algebra 2 by 30 points. In a random sample of 25 students who used the software, the average was 21 points, and had a standard deviation of 12 points. What is the z-value? Do we accept or reject the claim based on the z-value? Explain. *
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Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

Even if a person is in very good shape, applying to be a police officer requires commitment to fitness. applicants must pass a physical fitness test. in order to prepare for the test, janet purchases an activity tracker to court her steps. her goal is to walk 10,000 steps each day. she measures heard average step length to be 30 inches. play janet runs, her average steps length increases to 36 in. how many steps would she have to take to run 1 mile 50280 round to the nearest step

Explain how you can show five less than a number using an algebraic expression