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viktelen [127]
3 years ago
10

Irwin rode his bicycle from one end of a trail to another and back at a speed of 20 miles per hour. If the trail is 4 miles long

, for how many hours was Irwin riding?
0.2 hours
0.4 hours
2.5 hours
5.0 hours
Mathematics
3 answers:
Vesnalui [34]3 years ago
4 0

Answer:

B

Step-by-step explanation:

I took the quiz

pentagon [3]3 years ago
3 0

Answer: I believe it’s C. 2.5

Step-by-step explanation:

Edgar Ramirez2 years ago
0 0

Answer: 5.0/5

Explanation: 20/1 x 1/4 = 20/4
Divide 20 (the numerator) by 4 (the denominator) and you get "5" or "5.0". And that's your answer, hope it helps!

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The smiths have two children. The sum of their ages is 23. The produce of their ages is 132. How old are the children?
kolezko [41]

For this case we propose a system of equations:

x: Let the variable representing the age of the first child of the Smiths

y: Let the variable representing the age of the second child of the Smiths

According to the data of the statement we have to:

x + y = 23\\x * y = 132

From the first equation we have to:

x = 23-y

We substitute in the second equation:

(23-y) * y = 132\\23y-y ^ 2 = 132\\y ^ 2-23y + 132 = 0

We find the solutions by factoring:

We look for two numbers that, when multiplied, result in 132 and when added, result in 23. These numbers are 11 and 12.

Thus, we have that the factorized equation is:

(y-11) (y-12) = 0

Thus, the solutions are:y_ {1} = 11\\y_ {2} = 12

So, we can take any of the solutions:

With y = 11

Thenx = 23-11 = 12

Therefore, the ages of the children are 11 and 12 respectively.

Answer:

 The ages of the children are 11 and 12 respectively.

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