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3 years ago

I NEED HELP I DONT UNDERSTAND

Mathematics

1 answer:

Vikki [24]3 years ago

6 0

Answer:

answers are given below

Step-by-step explanation:

Circumference = $2\pi r$

Where 2r = Diameter

Hence

Circumference = $\pi \times Diameter$

No there is no such circle in which relationship between Radius and Diameter can be represented without $\pi$ .

This is because while deriving the relation the angle measurement ts taken into consideration and the angle are measured in radians i.e. in terms of $\pi$ not degrees.

3. We can not determine the exact circumference because $\frac{22}{7}$ is a rational number and but its value is approximately taken from $\pi$ and $\pi$ is an irrational number

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Cole has 8 pieces of string that are 5 yards each. He uses 4 pieces that are each 5 feet long. How many feet of string does Cole

enyata [817]

100 feet left. A yard is 3 feet. Theres 5 yards in 8 pieces. 5*3=15 and 15*8=120. He uses 4 pieces that are 5 feet. 5*4=20. He uses 20 feet. 120-20= 100.

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3 years ago

Anne owns a used car lot and in order to get cars to sell, she buys used cars at an

azamat

Answer:

It would be 2,000x+200

Step-by-step explanation:

okay it costs $200 to attend so that's a cost you are going to have to pay regardless. The $2,000 depends on how many cars you buy. So it would be 2,000 (times how ever many cars you buy) plus the $200.

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3 years ago

Compute the value of the discriminant and give the number of real solutions of the quadratic equation.

Sergio039 [100]

$-2x^2+6x-3=0 \\ \\
a=-2 \\ b=6 \\ c=-3 \\ \Delta=b^2-4ac=6^2-4 \times (-2) \times (-3)=36-24=12$

The value of the discriminant is 12.
Since the discriminant is greater than zero, the equation has two real solutions.

4 0

3 years ago

Factors of (1-x^2) answer fast please

MatroZZZ [7]

Answer:

(−x−1)(x−1) or 1−x^2

Step-by-step explanation:

(1-x^2)

Rewrite 1-x^2 as 1^2-x^2. The difference of squares can be factored using the rule: a^2

−b^2=(a−b)(a+b).

(1−x)(1+x)

Reorder the terms.

(−x+1)(x+1)

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3 years ago

Suppose theta= 11pi/12. How do you use the sum identity to find the exact value of sin theta?

SIZIF [17.4K]

The better way is, first we have to find the equivalent in degrees

$2\pi=360\º$

$\frac{11\pi}{12}=345\º$

now we can change this value to $-15\º$

how do we get an angle like this?!

$30\º-45\º=-15\º$

then

$sin(30\º-45\º)=sin(30\º)*cos(45\º)-sin(45\º)*cos(30\º)$

$\begin{Bmatrix}sin(30\º)&=&\frac{1}{2}\\\\sin(45\º)&=&cos(45\º)&=&\frac{\sqrt{2}}{2}}\end{matrix}\\\\cos(30\º)&=&\frac{\sqrt{3}}{2}\end{matrix}$

now we replace this values

$sin(-15\º)=\frac{1}{2}*\frac{\sqrt{2}}{2}-\frac{\sqrt{2}}{2}*\frac{\sqrt{3}}{2}$

$sin(-15\º)=\frac{\sqrt{2}}{4}-\frac{\sqrt{6}}{4}$

$\boxed{\boxed{sin(-15\º)=sin(345\º)=\frac{\sqrt{2}-\sqrt{6}}{4}}}$

4 0

3 years ago

I NEED HELP I DONT UNDERSTAND​

I NEED HELP I DONT UNDERSTAND