Step 1

Given, the function W that models the weight of a kitten, in ounces, that is alpha weeks old for \(\displaystyle{0}\le{a}\le{6}\) is defined as

\(\displaystyle{W}{\left(\alpha\right)}={1.9}\alpha+{2.3}\)

Step 2

We need to find the weight of a kitten that is 3 weeks old,i.e.we need to compute the value of W(3).

According to the given model,

\(W(3) = 1.9(3)+2.3=5.7+2.3=8\) ounces

Result: The weight of a 3 weeks old kitten is 8 ounces.