Evaluate 20x y given that x=15 and y= 10.

Mathematics

2 answers:

Gnoma [55]3 years ago

6 0

Answer:

3000

Step-by-step explanation:

Oksana_A [137]3 years ago

3 0

Answer:

3000

Step-by-step explanation:

20xy
20×15×10
just let the x and y into it..

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An arch in the shape of a parabola has a height of 50 feet at the center and a span of 120 feet across. Find the height of the a

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Check the picture below.

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$~~~~~~\textit{vertical parabola vertex form} \\\\ y=a(x- h)^2+ k\qquad \begin{cases} \stackrel{vertex}{(h,k)}\\\\ \stackrel{"a"~is~negative}{op ens~\cap}\qquad \stackrel{"a"~is~positive}{op ens~\cup} \end{cases} \\\\[-0.35em] \rule{34em}{0.25pt}$

$\stackrel{vertex}{(0~~,~~50)}\implies y=a(x-0)^2+50\implies y = ax^2+50 \\\\\\ \begin{cases} x =60\\ y = 0 \end{cases}\implies 0=a6^2+50\implies -50=3600a\implies -\cfrac{50}{3600}=a \\\\\\ -\cfrac{1}{72}=a~\hfill therefore~\hfill \boxed{y=-\cfrac{1}{72}x^2+50}$