All categories

2 years ago

Can someone help me please. (TROLLS WILL BE REPORTED!!!)

Mathematics

1 answer:

denpristay [2]2 years ago

3 0

Answer:

B.) 54π units²

Step-by-step explanation:

First, we need to find the height of the cone. We can do this using the Pythagreom Theorem.

a² + b² = c² <----- Pythagreom Theorem

3² + b² = 15² <----- Insert side lengths

9 + b² = 225 <----- Solve 3² and 15²

b² = 216 <----- Subtract 9 from both sides

b = 14.7 units <---- Take square root of 216

Now, we can use the surface area of a right cone equation to find the final answer.

r = 3 units

h = 14.7 units

SA = πr(r + √(h² + r²)) <----- Surface Area equation

SA = π(3)(3 + √(14.7² + 3²)) <----- Insert values

SA = π(3)(3 + √(216 + 9)) <----- Solve 14.7² and 3²

SA = π(3)(3 + √225) <----- Add 216 and 9

SA = π(3)(3 + 15) <----- Take square root of 225

SA = π(3)(18) <----- Add 3 and 15

SA = 54π units² <----- Multiply 3 and 18

You might be interested in

What is the approximate perimeter of a semicircle with a radius of 8 m? Use pi star times = 3.14. Express your final answer to t

irga5000 [103]

The perimeter of a semicircle consists of two parts. (the curve and bottom)
That curve is half the distance around the circle, since it's been split in half.
The distance around a circle, the circumfrence, is equal to 2πr, where r is the radius of that circle. In this case, the circumfrence of the entire circle would be 16π. and so that curve would have a length of just 8π.
Using 3.14 for π, 8π = 8×3.14 = 25.12.
As for the flat part, that is the diameter (distance across) our circle.
The radius is the distance from the center of a circle to its edge, and always has half the length of the diameter. (you can break the diameter down into two radii)
If our radius is 8 meters, our diameter (the flat part of that semicircle) must be 16.
Now we add up the two parts of the perimeter...25.12 + 16 = 41.12.

5 0

3 years ago

Which inverse operation should be performed first?: m = 7 = 32.

Mumz [18]

The answer is multiplication

7 0

3 years ago

In a paper bag, 7 of the 15 marbles are yellow. In a cloth bag, 2 of the 15 marbles are yellow. If Tim randomly draws one marble

ddd [48]

Answer :

$\frac{7}{15}$ × $\frac{2}{15}$ = $\frac{14}{225}$

Step-by-step explanation:

P( $Event_{1}$ ) = choosing yellow marble from paper bag = $\frac{favourable outcomes}{possible outcomes}$ = $\frac{7}{15}$

P( $Event_{2}$ ) = choosing yellow marble from cloth bag = $\frac{favourable outcomes}{possible outcomes}$ = $\frac{2}{15}$

∵ Resultant outcome is dependent upon both the events and both events are independent from each other, so we can apply intersection rule [ P(A∩B)=P(A)×P(B) ] here

∴ Probability ( Both marbles are yellow) = P( $Event_{1}$ ) × P( $Event_{2}$ ) = $\frac{7}{15}$ × $\frac{2}{15}$

3 0

3 years ago

I don’t understand this

IrinaVladis [17]

It wants you to find how much money you will spend a year at each separate gym. That way you can find out which one is cheaper. Once you’ve done that, you need to find how many days it would take for both gym’s cost to be the same after so many days.

7 0

3 years ago

72 slices of pizza and 80 cookies were purchased for the after school tutoring program. Each student attending will get an equal

Tems11 [23]

Answer:

8 students

Step-by-step explanation:

72 slices of pizza and 80 cookies were purchased after a school program

Each student will get an equal numbert of both pizza and cookies

72/8

= 9

80/8

= 10-1

= 9

Hence 8 students can attend the after tutoring program

6 0

3 years ago