Answer:
Sarah bough 3 Angelfish and 5 Bloodfin Tetra
Step-by-step explanation:
Let a be the number of Angelfish fish and
b be the number of Bloodfin fish
Then according to the given statements
we get the following equations
![a+b = 8\ \ \ Eqn\ 1\\4.75a+1.50b=21.75\ \ \ Eqn\ 2](https://tex.z-dn.net/?f=a%2Bb%20%3D%208%5C%20%5C%20%5C%20Eqn%5C%201%5C%5C4.75a%2B1.50b%3D21.75%5C%20%5C%20%5C%20Eqn%5C%202)
From Equation 1
![a = 8-b](https://tex.z-dn.net/?f=a%20%3D%208-b)
Putting in equation 2
![4.75(8-b)+1.50b = 21.75\\38-4.75b+1.50b = 21.75\\38-3.25b = 21.75\\-3.25b = 21.75-38\\-3.25b = -16.25\\\frac{-3.25b}{-3.25} = \frac{-16.25}{-3.25}\\b = 5](https://tex.z-dn.net/?f=4.75%288-b%29%2B1.50b%20%3D%2021.75%5C%5C38-4.75b%2B1.50b%20%3D%2021.75%5C%5C38-3.25b%20%3D%2021.75%5C%5C-3.25b%20%3D%2021.75-38%5C%5C-3.25b%20%3D%20-16.25%5C%5C%5Cfrac%7B-3.25b%7D%7B-3.25%7D%20%3D%20%5Cfrac%7B-16.25%7D%7B-3.25%7D%5C%5Cb%20%3D%205)
Putting b=5 in equation 1
![a+5 = 8\\a = 8-5 = 3](https://tex.z-dn.net/?f=a%2B5%20%3D%208%5C%5Ca%20%3D%208-5%20%3D%203)
Hence,
Sarah bough 3 Angelfish and 5 Bloodfin Tetra
Answer:
D) $9.95
Corrected question;
! The regression equation y = 3.648 • 1.182^x approximates the cost to go on a safari, y, given the number of years since it opened in 2005, x. Which is the best estimate for the cost of a vehicle to drive through the safari in 2011?
Step-by-step explanation:
Given;
The regression equation
y = 3.648 • 1.182^x
Where;
x = number of years since it opened in 2005
y = the cost to go on a safari
For this case;
x at 2011 = 2011 - 2005
x = 6 years
Substituting into the regression equation;
y = 3.648 × 1.182^(6)
y = 9.948547753694156132352
y = $9.95
Around 25 because if you turn 32% into a decimal like this .32 then multiply by 76 you will get 24.32 which is closer to 25