What is the area of a circle whose radius is 5 ft? 57 ft2 107 fta 207 ft? 257 ft

Mathematics

2 answers:

marysya [2.9K]3 years ago

6 0

The area of a circle is pie times radius squared so... 3.14 * 5^2 = 78.5 and that is not an answer choice so idk.

rewona [7]3 years ago

3 0

Answer:

Step-by-step explanation:

π $* 5^{2}$ = 3.14 * 25 = 78.5

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Plz help,.................refresh the page before u answer

Inessa [10]

Using the quadratic equation instead of calculus, you can find the x coordinate of the vertex as it will be the midpoint of the two x coordinates of the zeros...

x=(-3±√-27)/2

x=-1.5±√-6.75

That the second term is imaginary does not matter because we will add or subtract this value from -1.5, thus the midpoint of the zeros, the x coordinate of the vertex is -1.5. And to find the value of y for the vertex we just find the value of y when x=-1.5

y(-1.5)=6.75

Since y>0, the vertex is above the x-axis.

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