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3 years ago

I need help with 9-14

Mathematics

1 answer:

Tanya [424]3 years ago

8 0

For number 9
So first put the equation in descending order
So it would be
6x^2 -10x -4
Then just plug it into the quadratic formula
(The image attached)
And that is your andwer

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A service station on the interstate charges $2.29 per gallon for gasoline and $1.89 per quart for oil. What would be a reasonabl

grigory [225]

Answer) $23
Explanation)
10 x 2.29 = 18.9
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3 years ago

Read 2 more answers

The circumference of a circle is 15n cm what is the area of the circle in terms of n

Mice21 [21]

Answer:

Area of circle is $\dfrac{225n^{2}}{4\pi} cm^{2}$

Step-by-step explanation:

Formula for circumference of circle is given as,

$C=2\pi r$

Given that C = 15 n cm,

Substituting the value,

$15n=2\pi r$

Solving above equation for r, divide both side by $2\pi$

$\dfrac{15n}{2\pi}=\dfrac{2\pi r}{2\pi}$

Simplifying,

$\dfrac{15n}{2\pi}=r$

Formula for area of circle is given as,

$A=\pi r^{2}$

Substituting the value of r,

$A=\pi \left(\dfrac{15n}{2\pi}\right)^{2}$

Squaring the parenthesis,

$A=\pi \left(\dfrac{225n^{2}}{4\pi^{2}}\right)$

Cancelling out the common term,

$A=\dfrac{225n^{2}}{4\pi}$

Therefore, area of circle in terms of n is $A=\dfrac{225n^{2}}{4\pi} cm^{2}$

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4 years ago

If m<9 = 119, what is the sum of the measure of <11 and <6

Phantasy [73]

If this is a triangle the the measure of angles 11 and 6 could be any number between 1 and 60

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3 years ago

Cylinder A has radius r and height h as shown in the diagram. Cylinder B has radius 4r and height 4h. How many times greater is

svetlana [45]

Answer:

The surface area of Cylinder B is 16 times the surface area of Cylinder A

Step-by-step explanation:

<u>Note</u>: <em>It is assumed we are looking at the total surface area (but the answer would be same for both cases)</em>

<h3>Given</h3>

Cylinders A with radius - r, height - h,
Cylinder B with radius - 4r, height - 4h.

The ratio of total surface areas of cylinder B to A

<h3>Solution</h3>

Total surface area of cylinder A is:

$S_A = 2\pi r(h + r)$

Total surface area of cylinder B is:

$S_B = 2\pi(4r)(4r + 4h) = 8\pi(4)(r + h) = 32\pi(r + h)$

Find the ratio of areas:

$\cfrac{S_B}{S_A} =\cfrac{32\pi(r+h)}{2\pi(r+h)} =16$

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3 years ago

Genny's monthly salary was $2000in November. In December she received a 20% raise. In January, what was Genny's monthly salary?

diamong [38]

Answer:400

Step-by-step explanation:

10%= 200

x2=400

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3 years ago