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3 years ago

2. CARS It took Lisa 85 minutes to wash three cars. She spent x minutes on each car and 10 minutes

Mathematics

2 answers:

melisa1 [442]3 years ago

7 0

Answer:

please don't delete

Step-by-step explanation:

ill give points back

docker41 [41]3 years ago

5 0

You have to divide 85 to 10 to get the answer

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3 years ago

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3 years ago

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Step2247 [10]

Answer:

$A = 297\pi$

Step-by-step explanation:

To solve this problem we need to be familiar with the formula for the surface area of a cone:

$A = \pi r(r + \sqrt{h^2+r^2})$

We are given the length of a side and the diameter, to calculate the radius divide the diameter in half:

$r = \frac{d}{2}\\r = \frac{18}{2}\\r = 9 cm$

To calculate the height of the cone, we must use the Pythagorean Theorem:

$C^2 = A^2 + B^2$

We can treat the side length as the hypotenuse $C$ , the radius as the base $A$ , and solve for height $B$ . Set the expression up like this:

$C^2 = A^2 + B^2\\24^2 = 9^2 + B^2\\B^2 = 24^2 - 9^2\\B = \sqrt{24^2 - 9^2}\\B = \sqrt{576 - 81}\\B = \sqrt{495}\\B \approx 22.25$

Now we can plug into our original formula:

$A = \pi r(r + \sqrt{h^2+r^2})\\A = \pi 9(9+\sqrt{\sqrt{495}^2+9^2}\\A = \pi 9(9+\sqrt{495 + 81}\\A = \pi 9(9+\sqrt{576})\\A = \pi 9(9 + 24)\\A = \pi 9(33)\\A = 297\pi$

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2 years ago

10A. A triangle has side lengths of 10 centimeters, 24 centimeters and 28

tekilochka [14]

Answer:

Step-by-step explanation:

10² + 24² ≠ 28²

6 0

2 years ago