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3 years ago

5

A reflecting telescope contains a mirror shaped like a parabola of revolution. If the mirror is 16 inches across at its opening

and is 2 feet deep, where will the light be concentrated?

1 answer:

choli [55]3 years ago

5 0

Answer:

18

Step-by-step explanation:

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What two patterns is in the table show

serg [7]

Answer:

X= 25, the second one is 22, the third one is 19

y=20, the second one is 17, the thirst one is 12

The terms in patten y is 5 less than the terms in pattern x

Step-by-step explanation:

3 0

3 years ago

A tiny but horrible alien is standing at the top of the Empire State Building (which is

Leto [7]

Answer:

87.7 degrees.

Step-by-step explanation:

In triangle ABC, attached.

The height of the building |AB|=443 meters

The distance of the agent across the street , |BC|=18 meters

We want to determine the angle at C.

Now,

$Tan C=\dfrac{|AB|}{|BC|} \\C=arctan (\dfrac{|AB|}{|BC|} )\\=arctan (\dfrac{443}{18} )\\=87.67^\circ\\\approx 87.7^\circ $(correct to the nearest tenth)$

The agent should sfoot his laser gun at an angle of 87.7 degrees.

7 0

3 years ago

What is the least common multiple (LCM) of 4 and 15? A. 19 B. 20 C. 60 D. 30

ad-work [718]

Answer:

C

Step-by-step explanation:

Multiples of 4: 4,8,16,20,24,28,32,36,40,44,48,52,56,60

Multiples of 15: 15,30,45,60

Th smallest number that they both can multiply to is 60

8 0

3 years ago

Read 2 more answers

What is the domain of the function f(x) = x^2 + 5?

Sophie [7]

The domain is R so the first one is correct.

4 0

3 years ago

There are 412 students and 20 teachers taking buses on a trip to a museum. Each bus can seat a maximum of 48. Which inequality g

-BARSIC- [3]

The inequality $\mathrm{b} \geq \frac{\text { total number of travelers }}{\text { capacity of each bus }}$ gives the least number of buses, b, needed for the trip. The least number of buses is 9

<u>Solution:</u>

Given that, There are 412 students and 20 teachers taking buses on a trip to a museum.

Each bus can seat a maximum of 48.

We have to find which inequality gives the least number of buses, b, needed for the trip?

Now, there are 412 students and 20 teachers, so in total there are 412 + 20 = 432 travelers

<em><u>The number of buses required “b” is given as:</u></em>

$\text { (b) } \geq \frac{\text { total number of travelers }}{\text { capacity of each bus }}$

$\text { So, number of buses required } \geq \frac{432}{48}$

Number of buses required ≥ 9 buses.

But least number will be 9 from the above inequality.

Hence, the inequality $\mathrm{b} \geq \frac{\text {total number of travelers}}{\text {capacity of each bus}}$ gives least count of busses and least count is 9.

6 0

3 years ago