Solve.
-The number $B$ (measured in thousands) of a certain type of endangered bird can be approximated by the equation $B = 1.78 x ^ { 2 } + 3.5 x + 6.42$, where $x$ is the number of years after 1998 . How many birds does the equation predict there will be in the year 2005 ?
A) 111,720 birds
B) 118,140 birds
C) 43,380 birds
D) 97,140 birds

Question

Quizplus · Accepted Answer

To find the number of birds in 2005, we substitute $x = 2005 - 1998 = 7$ into the equation: $B = 1.78(7)^2 + 3.5(7) + 6.42 = 1.78(49) + 24.5 + 6.42 = 87.22 + 24.5 + 6.42 = 118.14$. Since $B$ is measured in thousands, the prediction is 118,140 birds.

Solve -The Number BBB (Measured in Thousands) of a Certain Type of Endangered Bird

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-The Number $B$ (Measured in Thousands) of a Certain Type of Endangered Bird