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notsponge [240]
3 years ago
12

How many minutes he does arm routine and abdominal routine

Mathematics
1 answer:
AlekseyPX3 years ago
5 0
Let x be the amount of time it takes to perform an arm routine and y be the amount of time it takes to perform an abdominal routine.  We see:

4x+y=70
4x+2y=100

Subtracting the second equation from the first gives y=30.  Substituting gives 4x+30=70, so 4x=40 and x=10.

Thus, an arm routine takes ten minutes and an abdominal routine takes thirty minutes.
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What is the recursive rule for the following sequence: -9, -2, 5, 12, ….
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The answer is option (C)=an-1+7

Step-by-step explanation:

A recursive rule is a formula that in which each term is expressed as a function of its preceding term(s), meaning in order to get to the nth term you have to express it in a form of the term that comes before it. In our case the a(n-1) term

So for the sequence -9, -2, 5, 12

The nth term is any number on the sequence and

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To get -2 from -9 we have to add 7 to -9; -9+7=-2

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An electronics company makes communication devices for military contracts. The company just completed two contracts. The navy co
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Workers of army contract were more productive.

Step-by-step explanation:

To determine on which contract the workers were more productive compute the work done per hour by the workers for both contracts.

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Number of workers = 25

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Number of hours per week = 40

The number of hours it took 25 workers to produce 2300 devices is =

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Number of workers = 35

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The number of hours it took 35 workers to produce 5500 devices is ==35\times3\times40\\=4200\ hours

Then number of devices produced in 1 hour is = \frac{5500}{4200}= 1.31\ devices\ per\ hour

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