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Vaselesa [24]
3 years ago
11

What is the perimeter of a rectangle whose sides are of lengths (3z+2) units and (2z+3) units

Mathematics
2 answers:
tiny-mole [99]3 years ago
8 0
We know, the Perimeter = 2(l + w)
Here., l = 3z + 2
w = 2z + 3

Substitute their values, 
P = 2(3z + 2 + 2z + 3)
P = 2(5z + 5)
P = 10z + 10

In short, Your Answer would be 10z + 10

Hope this helps!
Lerok [7]3 years ago
6 0
2(3z+2)+2(2z+3)
6z+4+4z+6
6z+4z+4+6
(10z+10) units

Hope this helps :)
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2 years ago
The cost, C, to produce b baseball bats per day is modeled by the function C(b) = 0.06b2 – 7.2b + 390. What number of bats shoul
kozerog [31]

Check the picture below, that's just an example of a parabola opening upwards.

so the cost equation C(b), which is a quadratic with a positive leading term's coefficient, has the graph of a parabola like the one in the picture, so the cost goes down and down and down, reaches the vertex or namely the minimum, and then goes back up.

bearing in mind that the quantity will be on the x-axis and the cost amount is over the y-axis, what are the coordinates of the vertex of this parabola?  namely, at what cost for how many bats?

\bf \textit{vertex of a vertical parabola, using coefficients} \\\\ C(b) = \stackrel{\stackrel{a}{\downarrow }}{0.06}b^2\stackrel{\stackrel{b}{\downarrow }}{-7.2}b\stackrel{\stackrel{c}{\downarrow }}{+390} \qquad \qquad \left(-\cfrac{ b}{2 a}~~~~ ,~~~~ c-\cfrac{ b^2}{4 a}\right)

\bf \left( -\cfrac{-7.2}{2(0.06)}~~,~~390-\cfrac{(-7.2)^2}{4(0.06)} \right)\implies (60~~,~~390-216) \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill (\stackrel{\textit{number of bats}}{60}~~,~~\stackrel{\textit{total cost}}{174})~\hfill

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