**Answer:**

need more info

**Step-by-step explanation:**

**Answer:**

y=-14

**Step-by-step explanation:**

-y+9=23

-y=14

y=-14

**Answer:**

Hello the reference related to your question is missing attached below is the reference

<em>answer</em> : p ( x - y ≥ 1 ) = 0.0019

**Step-by-step explanation:**

Assuming 'X' and 'Y' are independent random samples

X : mean value = , variance = 0.4 /10 = 0.04

Y : mean value = , variance = 0.8/10 = 0.08

since the values are independent

V [ X - Y ] = V [ X ] + V [Y ] = 0.04 + 0.08 = 0.12

<u>Determine the probability that the sample mean for species A exceeds the sample mean for species B by at least 1 unit</u>

P ( x - y ≥ 1 ) = 0.0019

attached below is the detailed solution

So the numbers are x and y

x:y=5:4

x/y=5/4

this means that x is worth 5 units and y is worth 4 units so

x:y=5:4, therefore it can be represented by

x:y=5z:4z

we know that they add to 720

720=5z+4z

add like terms

720=9z

divide by 9

80=z

multiply by 4

320

80=z

mutipply by 5

400

the numbers are 400 and 320

5+2=7. add the y coordinates. the height is 7. it doesn't matter if 2 is negative in the graph.