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GalinKa [24]
3 years ago
13

(PLEASE ITS ACTUALLY MY LAST ONE HELP)

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

Answer:

B) C and G

Step-by-step explanation:

The radius is equal to 1/2 the diameter

r = 1/2 d

G has a diameter of 45

1/2 (45) = 22.5

C and G are the same

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PLZ HELP OR I FAIL MY TEST
Volgvan

Answer:

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Step-by-step explanation:

If R*T=D, and R is speed + or - current, how can you find the rate without the time, and how can you find the time without the rate?

THE KEY WAS WHEN WE WERE TOLD THAT IT TAKES ONE HOUR LONGER TO GO UPSTREAM THAN DOWNSTREAM BECAUSE T=D/R AND WE ARE TOLD THAT:

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time downstream=(distance downstream)/(rate downstream)=24/(10+x)

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24/(10-x)-1=24/(10+x) Multiply both sides by (10-x)(10+x)

24(10+x)(10-x)/(10-x)-1(10-x)(10+x)=24(10-x)/(10+x)/(10+x) clear fractions


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240+24x-100-10x+10x+x^2=240-24x subtract 240 from and add 24x to both sides

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This equation can be factored:

(x+50)(x-2)=0

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CK

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time downstream=24/12=2 hours

so 3-2=1----takes 1 hour longer upstream

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