Ooh questio 10 I forgot that! 30 points for who ever answers

Mathematics

2 answers:

prisoha [69]3 years ago

7 0

Answer:

B. The slope of the line of best fit shows that for each inch of rainfall, the growth of the plants increases 0.8 inches.

Step-by-step explanation:

Keep trying to do your own!

You're close, but see that the line slopes up, not down. If the growth decreased by 0.8 inches, the line would be going down, right? So the right answer would be B., because the growth of plants increases by 0.8 inches for each inch of rainfall.

You can use the equation for the line to check your answer.

When x = 0, y = 0. When x = 1, y = 0.8. When x = 2, y = 1.6, and so on. The line's y output increases by 0.8 every time x increases by 1.

puteri [66]3 years ago

4 0

Answer:

i believe it is the second one as the rainfall increases the plants grow by approx .8 inches for each inch of rainfall.

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Find the angle between u = (-2,-5) and v = (5,2)

OleMash [197]

The angle between u = (-2,-5) and v = (5,2) is 134 degrees approximately.

<u>Solution:</u>

Given, two vectors are u = (-2, -5) and v = (5, 2)

We have to find the angle between two vectors.

We know that,

$a. b=\|a\| .\|b\| \times \cos \theta$

where $\theta$ is angle between vectors a and b

$\text { Now vectors are }(-2 \vec{\imath}-5 \vec{\jmath}) \text { and }(5 \vec{\imath}+2 \vec{\jmath})$

$(-2 \vec{\imath}-5 \vec{\jmath}) \cdot(5 \vec{\imath}+2 \vec{\jmath})=\sqrt{(-2)^{2}+(-5)^{2}} \times \sqrt{5^{2}+2^{2}} \times \cos \theta$

$\text { since }\|a\|=\sqrt{x^{2}+y^{2}} \text { for } a=x \vec{\imath}+y \vec{\jmath}$

$\begin{array}{l}{-10-10=\sqrt{29} \times \sqrt{29} \times \cos \theta} \\\\ {-20=29 \times \cos \theta} \\\\ {\cos \theta=\frac{-20}{29}} \\\\ {\theta=\cos ^{-1} \frac{-20}{29}} \\\\ {\theta=133.60}\end{array}$