2 years ago

What is the perimeter of 12cm and 18cm

Mathematics

1 answer:

NemiM [27]2 years ago

3 0

Answer:

40cm.

Step-by-step explanation:

40cm is the answer .

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a survey mr thrones class shows that 5 out of 8 students will by lunch how many out of 720 students in the school will buy lunch

never [62]

5/8 that's how ratio of students that will buy lunch. so in order to find number students who will buy the lunch out of 720, just multiply 720 with 5/8 ie, 720x5/8 ie 450.

450 is answer

8 0

2 years ago

Use (<,>,=) to compare 2/3 and 3/4

lina2011 [118]

2/3 < 3/4. Hope that helps

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2 years ago

5. Evaluate 10+ (4 23 + 7) - 19 A. 30 B. 33 C. 47 D. 45

Lyrx [107]

Answer:

10+ (4 23 + 7) - 19

I don't know if the 4 is supposed to be multiple or subtract or to add but If it is add

4 0

2 years ago

4. The reflecting dish of a parabolic microphone has a cross-section in the shape of a parabola. The microphone itself is placed

elixir [45]

Assume the parabola is placed on a graph where the x-axis is the top of the dish.
The vertex is then at (0,-30) The x-intercepts or zeros are at (-30,0) and (30,0)

The equation of such parabola would be:
$y = a(x+30)(x-30)$
Plug in vertex to find value of 'a'
$-30 = a(0+30)(0-30) \\ \\ a = \frac{-30}{(-30)(30)} = \frac{1}{30}$

Now find the focus given that $p = \frac{1}{4a}$
$p = \frac{1}{4(1/30)} = \frac{30}{4} = 7.5$

Answer: the microphone should be placed 7.5 inches from vertex.

8 0

2 years ago

#20 i

Ivahew [28]

Answer:

First, we need to know the relationship between "a" and "c". And "10" is not a co-ordinate. A co-ordinate has 2 or 3 numbers in it like 10,17, or like 10,17,5.

Step-by-step explanation:

8 0

2 years ago