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3 years ago

Can someone help on my math test? giving out brainiest!

Mathematics

2 answers:

katovenus [111]3 years ago

8 0

Answer:

None of them are correct because the circumference formula is 2pir

vesna_86 [32]3 years ago

8 0

Answer:

Neither one of them is correct

Step-by-step explanation:

Since the formula to find the circumference of a circle is C = dπ or C = 2πr. We know that a diameter of the circle is the same as 2 times the radius of the circle, here Sawyer and his sister are both saying the same thing, one way or the other. When Sawyer says C = d, he should multiply the d with a pi sign to get the correct circumference. Similarly when his sister says C = 2r, she is stating the congruent equation to the one of Sawyer's, therefore she needs to multiply 2r by the pi sign to get the correct circumference. Hence, both Sawyer and his sister are wrong stating the equation to solve for the circumference of the circle.

Hope this helps!

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What is the measure of the indicated arc in radians?

iogann1982 [59]

Answer:

D is the right one

Step-by-step explanation:

π radian = 180 degree

-> 135 degree = $\frac{135}{180}$ π radian

-> 135 degree = 0.75 * π radians = 3π/4 radian

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3 years ago

A person wishes to mix coffee worth nine dollars per pound with coffee worth three dollars per pound to get 240 pounds of a mixt

Anastasy [175]

$\bf \begin{array}{lccclll}
&amount&price&priced\ amount\\
&-----&-----&--------\\
\textit{9 bucks/lb}&x&9&9x\\
\textit{3 bucks/lb}&y&3&3y\\
-----&-----&-----&-------\\
mixture&240&5&1200
\end{array}
\\\\\\
\begin{cases}
x+y=240\implies \boxed{y}=240-x\\
9x+3y=1200\\
----------\\
9x+3\left( \boxed{240-x} \right)=1200
\end{cases}$

solve for "x".

what about "y"? well, y = 240 - x

4 0

3 years ago

6x+1=6x-8. I need to show my work also

Alenkasestr [34]

Answer:

No solution.

Step-by-step explanation:

Lets try to solve it.

6x + 1 = 6x - 8 Bring like terms to the same side:

6x - 6x = -8 - 1

0 = -9 which is absurd so there is no solution to this equation.

7 0

3 years ago

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How many real number solutions does the equation have

Ksju [112]

You have to find the discriminat b^2 -4ac

If it is > 0, the function has two real solutions
if it is = 0, the function has one real solution
if it is <0, the function has no real solution

6^2 - 4(7)(3) = 36 - 84 = - 48

Answer c. no solution

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3 years ago

0.2x + 1 = 1.6x + 3.1 What value of x satisfies the equation above?

guapka [62]

Answer:

x = -1.5

General Formulas and Concepts:

Pre-Alg

Order of Operations: BPEMDAS
Equality Properties

Step-by-step explanation:

Step 1: Define equation

0.2x + 1 = 1.6x + 3.1

Step 2: Solve for x

Subtract 0.2x on both sides: 1 = 1.4x + 3.1
Subtract 3.1 on both sides: -2.1 = 1.4x
Divide both sides by 1.4: -1.5 = x
Rewrite: x = -1.5

Step 3: Check

Plug in x to verify it's a solution.

Substitution: 0.2(-1.5) + 1 = 1.6(-1.5) + 3.1
Multiply: -0.3 + 1 = -2.4 + 3.1
Add: 0.7 = 0.7

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3 years ago

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