Emma is part of a team developing a new water softening agent. After gathering data about the softening agent's concentration in a volume of water over time, Emma recognizes this is an exponential decay situation and uses her computer to develop a model of the curve of best fit. The model of the curve of best fit for Emma's data has a correlation coefficient of r = -0.28. Which statement about Emma's model is true? Emma is part of a team developing a new water softening agent. After gathering data about the softening agent's concentration in a volume of water over time, Emma recognizes this is an exponential decay situation and uses her computer to develop a model of the curve of best fit. Which statement about Emma's model is true? The model of the curve of best fit for Emma's data has a correlation coefficient of r = -0.28 Predictions made using Emma's model are reliable because r is closer to 0 than -1. Predictions made using Emma's model are unreliable because r is not positive. Predictions made using Emma's model are unreliable because r is closer to 0 than -1. Predictions made using Emma's model are reliable because r is not positive.

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step-by-step explanation:

hope this is what you were asking for!

step-by-step explanation:

statement #3: proof- ang is congruent to ang ecd : angles are congruent.  

step-by-step explanation:

1: the missing angles in statement #3  

a.) acb  

reason- the reason why the answer is acb is because angle ecd and angle acb are both the same size *that's what the word congruent means this is really simple.  

2: the missing word in reason #3  

c.) vertical  

reason- the reason why the answer is vertical is because the angles in that diagram on figure 2 is slanted, which is vertical, and the e and a both lay on vertical lines. along with the other's, but e and a are the 2 main points you want to focus on. and c is kind of like your starting point, because c is for both angles, not just one.  

i hope that was and understanding.

18 units²

step-by-step explanation:

first let's find altitude bd using the distance formula

d = √((y₂ - y₁)² + (x₂ - x₁)²)

bd = √((0 - -3)² + (0 - 3)²)

bd = √18

given the placement of points a and c, we can denote that point d bisects segment ac.

we will call ac the base.

using the distance formula

ac = √((0 - 6)² + (-6 - 0)²)

ac = √72

knowing our base and our height, we can plug these into our triangle area formula

area = (b * h)/2

area = (√18 * √72) / 2

area = (√1296) / 2

area = 36 / 2

area = 18 units²