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hammer [34]
2 years ago
5

Fred, Tom, And Nancy Have 21 pencils all together. if the pencils are equally divided, How many will each person get?

Mathematics
2 answers:
rewona [7]2 years ago
4 0
•———-Hai———-•
•———Its 7———•
ElenaW [278]2 years ago
3 0

Answer:

7

Step-by-step explanation:

21/3=7

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7 times 10 to the -7 power
klasskru [66]

Answer:

0.0000007 as a regular notation

or 7x10^-7 as scientific notation

3 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
What are all the primes of 52
AleksandrR [38]
<span>52 can be broken down to the following 
2*26 =52
2*(2*13) <---13 x 2=26 x 2=52 
2*2*13 or 2^2*13 <--BOTH mean the same thing :)  </span><span>
</span>
6 0
3 years ago
Please help ASAP!<br> Thank you
Leno4ka [110]
The answer has to be 16 because when you add them it goes up
6 0
3 years ago
Read 2 more answers
) A store is having a 30% off sale. Michelle uses the expression 0.7p and Stuart uses the expression p-0.3p. Who is using the co
Aleonysh [2.5K]

Answer:michelle

Step-by-step explanation: it is 70% of the cost since it’s 30% of the original

3 0
3 years ago
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