Please help. Will mark Brainliest to whoever gets it right! :)

Mathematics

2 answers:

levacccp [35]3 years ago

6 0

Answer:

A's average speed is 100. I did this same thing and passed my grade.

erma4kov [3.2K]3 years ago

6 0

Answer:

Step-by-step explanation:

To answer the question we must find the Time of B.

This should be easy considering the fact that we have are given the Distance and the Speed.

$\frac{D}{S}$ = T

$\frac{60}{40}$ = 1.5 hours or 1 hour and 30 minutes

Now, we know both routes that the same amount of time.

Now we know both routes take 1 hour and 30 minutes

Now we divide 90 by 1.5 to get our Speed for A

$\frac{90}{1.5}$ = 60km/hr

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A sphere with radius 16 m is cut by a plane that is 9 m below its center. what is the best approximation of the area of the circ

alexdok [17]

The complete question in the attached figure

we know that
the equation of a sphere is
(x-h)²+(y-k)²+(z-l)²=r²

<span>let's assume that the center of the sphere is at the origin
</span>so
(h,k,l)-------> (0,0,0)
for r=16 m
(x-h)²+(y-k)²+(z-l)²=r²--------> (x)²+(y)²+(z)²=16²

for z=9 m
(x)²+(y)²+(9)²=16²--------> (x)²+(y)²=256-81--------> (x)²+(y)²=175
the radius of the circle is r=√175 m
so the area of the circle A=pi*r²-----> A=pi*175-----> A=549.5 m²

the answer is
the area of the circle is 549.5 m²