Mathematics, 27.11.2019 04:31 ecoagro1934

A. diameter, d = 2rd = 2r the formula using function notation is ; the value when r = 5r = 5 is ; the diameter of the circle is feet when the radius is feet. b. area, a = πr2a = πr2 the formula using function notation is ; the value when r = 5r = 5 is ; the area of the circle is feet when the radius is feet. c. circumference c = 2πrc = 2πr the formula using function notation is ; the value when r = 5r = 5 is ; the circumference of the circle is feet when the radius is feet.

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Answer from: zookieblu

Answer with explanation:

Given : The diameter of the circle = 2r , where r is the radius.

Function notation for diameter : D(r)=2r

If the value of r= 5 feet

Then , the diameter of the circle is feet = 2(5) feet = 10 feet

Hence, the diameter of the circle is 10 feet when the radius is 5 feet.

Also, area of circle : $A=\pi r^2$ , where r is the radius .

Function notation for area : $A(r)=\pi r^2$

For r= 5 feet

$A(r)=\pi (5)^2$

$\Rightarrow\ A(r)=25\pi\text{ square feet}$

Hence, The area of the circle is $25\pi$ square feet when the radius is 5 feet.

Also, the circumference of circle = $2\pi r$

Function notation for circumference = $C(r)=2\pi r$

For r= 5 feet

$C(r)=2\pi (5)=10\pi \text{ feet}$

Hence, The circumference of the circle is $10\pi$ feet when the radius is feet.

Answer from: Quest

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

happy to

pls mark as brainliest

Answer from: Quest

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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