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3 years ago

Please help posted picture of question

Mathematics

1 answer:

Leni [432]3 years ago

8 0

Hello!

First you factor 28

2^2 * 7 = 28

Now we have

$\sqrt{2^{2} } \sqrt{7}$

If you take a square root of a square number they cancel out

$2 \sqrt{7}$

The answer is B) $2 \sqrt{7}$

Hope this helps!

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Help asap 80 points!

Montano1993 [528]

Answer:

[-3, 3]

Step-by-step explanation:

The function/ graph is defined from -3 to 3, inclusive of those values

3 0

2 years ago

Read 2 more answers

Can someone please answer. There is a picture. There is only one problem. Thank you so much!!!

madam [21]

Hello,

x²/25+y²/9=1

a=5, b=3 c²=a²-b²=25-9=16=4²

Foci are (0,4) and (0,-4)
Answer C
============

3 0

3 years ago

Two airplanes are flying in the air at the same height. Airplane A is flying east at 300mi/h and airplane B is flying north at 2

Ipatiy [6.2K]

Answer:

$\frac{dAB}{dt}=340 mil/h$

Step-by-step explanation:

The change of distance over time of the plain A is 300 mi/hour and 200 mi/hour for plane B. O is the point of the airport.

So, the distance from A to O AO = 90 miles and BO = 120 miles.

Now, we have a right triangle here. We can use the Pythagorean theorem, so the distance between the planes will be:

$AB^{2} =AO^{2}+BO^{2}$ (1)

$AB =\sqrt{AO^{2}+BO^{2}}=$

$AB =\sqrt{90^{2}+120^{2}}=150 miles$

If we take the derivative of the equation (1) we could find the change of the distance between planes.

$2AB\frac{dAB}{dt}=2AO\frac{dAO}{dt}+2BO\frac{dBO}{dt}$

$2*150\frac{dAB}{dt}=2*90*300+2*120*200=102000 mil/h$

$\frac{dAB}{dt}=\frac{102000}{150*2}$

Finally,

$\frac{dAB}{dt}=340 mil/h$

I hope it helps you!

6 0

3 years ago

3/4 divided by 15 =<br> need help plz

vova2212 [387]

Answer:

Step-by-step explanation:

3/4 divied by 15 = 1/20

4 0

3 years ago

for a ride on a rental scooter Kevin paid $6 fee to start the scooter plus $8 cents per minute of the ride the total bill for Ke

AlladinOne [14]

171 minutes
Explanation:
6 is the initial cost, .08 is the cost per minute and 19.68 is the total, set up an equation that looks like this: (x is the unknown variable)
6+.08x=19.68
19.68-6=13.68
.08x=13.68
.08x/.08=x
13.68/.08=171
x=171

8 0

2 years ago