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Pavel [41]
2 years ago
12

If the radius of a circle is doubled, how does the area of the circle change?

Mathematics
1 answer:
makkiz [27]2 years ago
5 0

Answer:

Quadruple the size

Step-by-step explanation:

Explanation:

When you enlarge a linear measurement by a scale factor a the area changes by a scale factor a2

So when you double the radius. scale factor 2, the area is increased by a scale factor:

22=4

So the area is quadrupled in this case.

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You can drive your car for 4.5 hours at the average speed of 70 miles per hour. how far did you go?
Zigmanuir [339]

Answer:


Step-by-step explanation:

28.5


3 0
3 years ago
A student says that the​ x-intercept of a line is ​(0,-10,​). Is the student​ correct? Explain.
nataly862011 [7]

Answer:

Yes, the student is correct

Step-by-step explanation:

Given

(0,-10)

Required

Does it represent the x intercept

At the x intercept, the value of x is 0.

So, the function (x,y) becomes (0,y)

(0,-10) can be compared to (0,y)

Hence, the student is correct

5 0
2 years ago
After moving 5 units up, 3 units right, and 4 units down, the ending position is (9, 6). What was the starting position.
Anika [276]
You reverse what you did, so first you go 5 units down which makes the coordinates (9,1) then you move 3 units left which then is (6,1). Then you go 4 units up which lets you end out at (6,5). 
6 0
3 years ago
Michael jogs at 3 miles per hour and Jack runs at 4.5 miles per hour. If Michael starts at 2:00 pm and Jack starts on the same c
tresset_1 [31]

Answer:

It will take Jack 40 minutes to cover the same distance which Micheal covers in 60 minutes. Both will meet at 3 miles distance at 3 pm.

Step-by-step explanation:

Micheal  runs 3 miles in one hour or 60 minutes.

In one minute he runs 3/60= 1/20  or 0.05miles.

Jack runs 4.5 miles in one hour or 60 minutes.

In one minute he runs 4.5/60= 45/600= 9/120= 3/40  or 0.075 miles.

So Jack is 0.075/0.05 = 1.5 times faster than Micheal.

or Micheal is 1.5 times slower than Jack.

Jack starts from 2:20 pm and at 3 pm he will run 0.075(40 minutes)= 3miles

Micheal start at 2:00 pm and at 3 pm he will run 0.05(60 minutes)= 3 miles

So at 3 pm both will have covered equal distance= 3miles.

It will take Jack 40 minutes to cover the same distance which Micheal covers in 60 minutes. Both will meet at 3 miles distance at 3 pm.

3 0
3 years ago
Need help quick please
valina [46]

Answer:

Disagree

Step-by-step explanation:

Remember rotating 90 degrees  means (y,-x)

A= (1,2)

A'= (2,-1)

So it is disagreed.

Hope this help :)

3 0
3 years ago
Read 2 more answers
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