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MA_775_DIABLO [31]
2 years ago
5

What’s the answer to this? Explanation would be helpful.

Mathematics
1 answer:
marta [7]2 years ago
3 0

Answer:

search mo foogle noe kasi mali

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What is the value of this​
frez [133]

Answer: 5.0625 or 5 1/16

Step-by-step explanation:

im smart

3 0
3 years ago
What is the slope of a line that is perpendicular to the line y = 8x + 5?
Bond [772]
The options are wrong lol, it is -1/8
8 0
3 years ago
A radio telescope has a parabolic surface, as shown below.
krek1111 [17]
OK, so the graph is a parabola, with points x=0,y=0; x=6,y=-9; and x=12,y=0

Because the roots of the equation are 0 and 12, we know the formula is therefore of the form

y = ax(x - 12), for some a

So put in x = 6

-9 = 6a(-6)

9 = 36a

a = 1/4

So the parabola has a curve y = x(x-12) / 4, which can also be written y = 0.25x² - 3x

The gradient of this is dy/dx = 0.5x - 3

The key property of a parabolic dish is that it focuses radio waves travelling parallel to the y axis to a single point. So we should arrive at the same focal point no matter what point we chose to look at. So we can pick any point we like - e.g. the point x = 4, y = -8

Gradient of the parabolic mirror at x = 4 is -1

So the gradient of the normal to the mirror at x = 4 is therefore 1.

Radio waves initially travelling vertically downwards are reflected about the normal - which has a gradient of 1, so they're reflected so that they are travelling horizontally. So they arrive parallel to the y axis, and leave parallel to the x axis.

So the focal point is at y = -8, i.e. 1 metre above the back of the dish.
5 0
2 years ago
Adrian has 5 times as many stickers as Derrick. If Adrian has 325 stickers, how many stickers does Derrick have?
Arte-miy333 [17]

Answer: 65

Step-by-step explanation:

65 x 5= 325

5 0
3 years ago
Solve the system
konstantin123 [22]
Use substitution. 

y = 2 - x and y = 4x + 7 can become

2 - x = 4x + 7

Now solve for x

-5 = 5x

-1 = x

Now plug -1 for x in either equation.

y = 2 - x -> y = 2 - (-1) -> y = 3
y = 4x + 7 -> y = 4*-1 + 7 -> y = -4 + 7 -> y = 3

So C) is the correct answer.
7 0
3 years ago
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