Mathematics
Mathematics, 06.12.2019 05:31, shikiaanthony

Keith applies a new brand of fertilizer to his grass. he finds that the rate at which the grass grows can be modeled by a linear function. he observes that the rate of growth is 1 centimeter every 3 days. after 18 days, he measures the height of the grass to be 8 centimeters. the initial height of the grass was _ centimeters tall?

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Biology, 22.07.2019 13:30, lol9691
Scientists are studying fertilizers to grass grow in southern california. fertilizer is any substance that can be added to soil to plants grow in it. in other words, fertilizer makes soil more fertile. the scientists set up different plots of land that all use the same type of soil, but they use different types of fertilizer in each plot. scientists then measure the grass growth in the different soils over time.how should scientists set up the control group in this experiment? a. a plot with grass but no fertilizer in the soil b. a plot with grass and many types of fertilizer in the soil c. a plot without any grass or any fertilizer in the soil d. a plot without any grass but with fertilizer in the soil
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Health, 10.10.2019 04:20, Horiizon93
Review a fertilizer company has created a new formula for its fertilizer that its scientists think will work better than tfrie original formula, but the new fertilizer has more expensive chemicals in it. they decide to test their new fertilizer against the old fertilizer . they plant 90 quadrants or grass. on 30 they put the new fertilizer, on another 30 they put the old fertilizer , and on the other 30 they use no fertilizer. they plant the same type of grass seeds on all 90 quadrants, wait two weeks and measure the average grass height on all 90 plots. they compare the three groups to each other. 1. what is the independent variable in this experiment? 2. what is the dependent variable in this experiment? 3. what is the control group in this experiment. 4. why is it necessary to have a control group?
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