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Alborosie
3 years ago
12

Donna has 6 hours to spend training for an upcoming race,she completes her training by running full speed the distance of the ra

ce and walking back the same distance to cool down. If she runs at a speed of 10 mph and walks at a speed of 2 mph, how long should she plan to spend walking back
Mathematics
1 answer:
LekaFEV [45]3 years ago
3 0
I'm sorry but I dont know
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What is the value of 4 x minus 7 when x = 4?191623
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7) Solve the following system of equations below algebraically using substitution.
Pani-rosa [81]

Answer:

x = 3.25

y =4.75

Step-by-step explanation:

In order to Solve the following system of equations below algebraically using substitution method we say that;

let;

8x - 4y = 7 ..................... equation 1

x + y = 8.......................... equation 2

from equation2

x + y = 8.......................... equation 2

x = 8 - y.............................. equation 3

substitute for x in equation 1

8x - 4y = 7 ..................... equation 1

8(8-y) - 4y = 7

64-8y-4y=7

64-12y=7

collect the like terms

64-7 = 12y

57= 12y

divide both sides by the coefficient of y which is 12

57/12 = 12y/12

4.75 = y

y =4.75

put y = 4.75 in equation 3

x = 8 - y.............................. equation 3

x = 8 -4.75

x = 3.25

to check if your answer is correct, put the value of x and y in either equation 1 or 2

from equation 2

x + y = 8.......................... equation 2

3.25 + 4.75 =8

8=8.................... proved

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3 years ago
Make a conjecture about the sum of the first 54 positive even numbers
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