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tekilochka [14]
3 years ago
13

The formula for the area, A, of a circle is A = πr2 , where r is the circle’s radius, and the formula for the circumference, C,

of a circle is C = πd , where d is the circle’s diameter. Which statement is correct?
Mathematics
1 answer:
Xelga [282]3 years ago
5 0

A circle is a two-dimensional line that forms a closed loop, where every point on that loop is an equal distance from the center.[1] The circumference (C) of a circle is its perimeter, or the distance around it.[2] The area (A) of a circle is how much space the circle takes up or the region enclosed by the circle.[3] Both area and perimeter can be calculated with simple formulas using the radius or diameter of the circle and the value of pi.


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A(x+1)(x-1)+b(x-2)(x+1)+(x+1)^2=9x-x-10 What is a+b?
igor_vitrenko [27]

a(x+1)(x-1)+b(x-2)(x+1)+(x+1)^2=9x^2-x-10

(x+1)(a(x-1)+b(x-2)+(x+1))=(x+1)(9x-10)

a(x-1)+b(x-2)+x+1=9x-10

Now this equation is much simpler!

(a+b)x-a-2b+x+1=9x-10

(a+b)x-a-2b=8x-11

(a+b-8)x-a-2b-11=0

a+b-8=(a+2b-11)/x

I can't solve it 3 variables and 1 equations means infinite answers so yea.

4 0
3 years ago
Find three consecutive odd integers such that 10 times the first, plus 10 times the second, equals 10 more than 10 times the thi
SIZIF [17.4K]

Answer:

4

Step-by-step explanation:

If x is the third number, then x−1 and x−2 are the second and first numbers.

10(x−2) + 10(x−1) = 10 + 10x

x − 2 + x − 1 = 1 + x

2x − 3 = 1 + x

x = 4

8 0
3 years ago
Find the sum of the sequence 31+32+33+34...+94
Nana76 [90]

Answer:

4000

Step-by-step explanation:

6 0
2 years ago
The length and width of a rectangle are measured as 31 cm and 28 cm, respectively, with an error in measurement of at most 0.1 c
MissTica

Answer:

\Delta A = 5.9\,cm^{2}

Step-by-step explanation:

The area of an rectangle is given by the following formula:

A = w\cdot h

Where:

w - Width, in centimeters.

h - Height, in centimeters.

The differential of the expression is derived hereafter:

\Delta A  = \frac{\partial A}{\partial w} \cdot \Delta w + \frac{\partial A}{\partial h}\cdot \Delta h

\Delta A = h \cdot \Delta w + w \cdot \Delta h

\Delta A = (31\,cm)\cdot (0.1\,cm) + (28\,cm)\cdot (0.1\,cm)

\Delta A = 5.9\,cm^{2}

5 0
3 years ago
How do I simplify this math problem?
mr Goodwill [35]
Basically, think of it as 3 / 1. 3√1 = 3/ 1 or 3/1 = 3 and 3√1 = 3
4 0
3 years ago
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