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myrzilka [38]
2 years ago
14

the number of calories consumed at snack varies directly with the number of cookies eaten. if mandy eats 3 cookies, she will con

sume 240 calories. how many calories will she consume if she eats 5 cookies
Mathematics
1 answer:
Nostrana [21]2 years ago
4 0

She will consume 400 calories if she eats 5 cookies.


3 cookies = 240 cal.

In order to solve for 5 cal. you need to find the unit rate first, divide both numbers by 3

3/3 = 1 

240/3 = 80

Now we know that 1 cookie = 80 cal.


5 cookies;

80 * 5 = 400 cal.

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7 0
2 years ago
I've been stuck on this for so long and I have an exam soon, anybody who can help me :'( ?
san4es73 [151]
(i)  speed = distance / time
so time =  distance / speed
here we have

time t = 1080/x  hours

(ii) return flight  time  = 1080 / (x + 30)  hours

(a)  1080/x - 1080/(x + 30) = 1/2

Multiplying  through by the LCD 2x(x + 30) we get:-

1080*2(x + 30) - 2x*1080 = x(x+30)
2160x + 64800 - 2160x = x^2 + 30x
x^2 + 30x - 64800  = 0

(b)  factoring;  -64800 = 270 * -240  ans 270-240 = 30 so we have

(x + 270)(x - 240) = 0   so x = 240  ( we ignore the negative -270)

So the speed for outward journey is 240 km/hr

(c) time ffor outward flight = 1080 / 240 =  4 1/2  hours

(d) average speed for whole flight = distance / time
   Time for outward journey = 4.5 hours and time for  return journey = d / v
= 1080 / (240+30) =  4 hours
 Therefore the average speed for whole journey =  2160 / 8.5 = 254.1 km/hr
8 0
2 years ago
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