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2 years ago

Find the circumference and the area of a circle with diameter 7 ft

Mathematics

2 answers:

Blababa [14]2 years ago

8 0

7pi hope I helped please give brainliest

defon2 years ago

6 0

Area formula: pi * radius * radius
Radius=1/2diameter=1/2(7)=3.5

3.5*3.5*pi=12.25pi square feet

Circumference formula: pi * diameter

7*pi=7pi feet

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Estimate the difference.

Simora [160]

Your answer would be 120

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2 years ago

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Ariel is working at a meat-packing plant 5 nights a week. Her regular wage is $11 an hour. She earns time and a half for any ove

svetlana [45]

Answer:

$11 would be earned

Step-by-step explanation:

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3 years ago

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What are the solutions to the equation

frosja888 [35]

Answer:

$x_1=\frac{1}{4}+(\frac{\sqrt{7}}{4})i$ and $x_2=\frac{1}{4}-(\frac{\sqrt{7} }{4})i$

Step-by-step explanation:

You have the quadratic function $2x^2-x+1=0$ to find the solutions for this equation we are going to use Bhaskara's Formula.

For the quadratic functions $ax^2+bx+c=0$ with $a\neq 0$ the Bhaskara's Formula is:

$x_1=\frac{-b+\sqrt{b^2-4.a.c} }{2.a}$

$x_2=\frac{-b-\sqrt{b^2-4.a.c} }{2.a}$

It usually has two solutions.

Then we have $2x^2-x+1=0$ where a=2, b=-1 and c=1. Applying the formula:

$x_1=\frac{-b+\sqrt{b^2-4.a.c} }{2.a}\\\\x_1=\frac{-(-1)+\sqrt{(-1)^2-4.2.1} }{2.2}\\\\x_1=\frac{1+\sqrt{1-8} }{4}\\\\x_1=\frac{1+\sqrt{-7} }{4}\\\\x_1=\frac{1+\sqrt{(-1).7} }{4}\\x_1=\frac{1+\sqrt{-1}.\sqrt{7}}{4}$

Observation: $\sqrt{-1}=i$

$x_1=\frac{1+\sqrt{-1}.\sqrt{7}}{4}\\\\x_1=\frac{1+i.\sqrt{7}}{4}\\\\x_1=\frac{1}{4}+(\frac{\sqrt{7}}{4})i$

And,

$x_2=\frac{-b-\sqrt{b^2-4.a.c} }{2.a}\\\\x_2=\frac{-(-1)-\sqrt{(-1)^2-4.2.1} }{2.2}\\\\x_2=\frac{1-i.\sqrt{7} }{4}\\\\x_2=\frac{1}{4}-(\frac{\sqrt{7}}{4})i$

Then the correct answer is option C.

$x_1=\frac{1}{4}+(\frac{\sqrt{7}}{4})i$ and $x_2=\frac{1}{4}-(\frac{\sqrt{7} }{4})i$

3 0

2 years ago

1. Three pounds of M&M’s cost $7.50. At this rate, what is the cost of 7 pounds?

Romashka [77]

Answer:

1. 17.50

2. 6

Step-by-step explanation:

1A: First you have to divide the cost by the three pounds to get the price per pound. Now that you have that answer you multiply it by 7 to get the price of 7 pounds.

2A: You can buy 6 pounds because if you multiply 7.5 x 6 you get 45 which you cannot add one more 7.50 so that is your final answer.

Hope this helps you ^^

8 0

2 years ago

Bro i need some help and I dont wanna get the question wrong so help please??

Rzqust [24]

Answer:

see below

Step-by-step explanation:

a) 1/7 is the smallest, so a is in the correct t location.

b) is 1/3, which is larger than 1/4

c) is 2/10 or 1/5, which is smaller than 1/4

so on the graph, b and c are backwards. c should be to the right of 1/4, and b should be to the left.

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3 years ago