P. E I. Answer the cross-word puzzle
1.a stroke to reply the service
2.
3.
4.
EF
5.
Across
2. a stock wherein the racket positioned slightly vertical.
4. a stroke wherein the racket is moved forward and upward at an angle
5. a stroke to start a rally.
Down
1. A stroke to reply the service.
2. A short stroke.​

How does a hydroelectric power plant converts energy into energy.

The chemical composition of soil varies with depth. an article in communications in soil science and plant analysis describes chemical analyses of soil taken from a farm in western australia. fifty specimens were each taken at depths 50 and 250 cm. at a depth of 50 cm, the average no3 concentration (in mg/l) was 88.5 with a standard deviation of 49.4. at a depth of 250 cm, the average concentration was 110.6 with a standard deviation of 51.5. find a 95% confidence interval for the difference in no3 concentrations at the two depths.

15) a substance used in manufacturing gasoline consists of finely divided platinum supported on an inert solid. suppose that the platinum is formed by the high temperature reaction between platinum (iv) oxide and hydrogen gas. the other product is water. a) write and balance the equation b) how many grams of hydrogen are needed to produce 1.0 g of platinum metal? c) how many moles of water are produced at the same time? how many grams? ( show work, .)