A botanist created a linear model to predict plant height from soil acidity (pH level) for a certain type of plant. The slope of the model was 2.5 centimeters per pH level, the standard deviation of the sample of plant heights was 4 centimeters, and the standard deviation of the soil acidities was 1 pH level. What is the value of the correlation coefficient?

1) earth's crust is made up of relatively rigid plates that ride atop earth's hot, semiliquid mantle. (2) the plates are called tectonic because they're in constant motion. (3) they can move because earth's mantle is a very hot and semiliquid fluid called magma. (4) volcanoes are a result of magma rising up or erupting through a plate, particularly where plate boundaries are moving against each other. (5) also, when plates slide against each other, causing friction along adjacent plate boundaries, earthquakes frequently occur. (6) therefore, we often find volcanoes and earthquakes along plate boundaries. (7) plates may also collide. (8) when that happens, mountain ranges are formed. (9) for example, the collision of the plate carrying the indian subcontinent created the himalayan mountains when it collided with the asian plate. 2. which sentence in this passage introduces a new topic that might begin a new paragraph? a. sentence 5 b. sentence 4 c. sentence 7 d. sentence 6

Some studies have found that what percentage of students have cheated in some form? a. 10% b. 25% c. 45% d. 75%

The following table lists the birth rate, death rate, and net migration rate for egypt over the past 20 years. on a coordinate plane, plot the birth rate data and death rate data for egypt. clearly, show each data point and label each curve. be sure to label the graph and axes. save a copy of your graph. then answer the following questions: (14 points) a. what was the annual growth rate for egypt in 1990? what is the estimated annual growth rate in 2010? be sure to show your work for each answer. b. where does egypt most likely fall on the demographic transition model? explain your answer using data from the table. describe two changes within egyptian society that would likely be necessary for egypt to transition to the next stage in the model. c. assuming egypt’s current birth rate, death rate, and net migration rate trends continue, what will the country’s annual growth rate likely be in 2030? if this growth rate is accurate, what would its doubling time be in 2030?