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siniylev [52]
3 years ago
5

The product of a number and 9 less than the number is 90. find the number.

Mathematics
1 answer:
Grace [21]3 years ago
7 0
15 is answer 
15-9=6 and 15x6= 90
   
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Decide whether the table shows a proportional relationship between x and y.
Serga [27]

Answer:

Yes

Step-by-step explanation:

I think it is proportional relationship. I hope my answer help you.

5 0
3 years ago
How do I solve 6a + 5a = −11
SashulF [63]

Answer:

a = - 1

Step-by-step explanation:

Step 1:

6a + 5a = - 11        Equation

Step 2:

11a = - 11         Combine Like Terms

Step 3:

a = - 11 ÷ 11       Divide

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Hope This Helps :)

5 0
3 years ago
Read 2 more answers
Is (-3,11) a solution to the system of equation shown below.
natita [175]
No, when you substitute it into the first equation for x and y it does not equal 36 this it's not a solution

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8 0
3 years ago
A particle moves on the hyperbola xy=18 for time t≥0 seconds. At a certain instant, y=6 and dydt=8. What is x that this instant?
professor190 [17]

Answer:

The value of x at this instant is 3.

Step-by-step explanation:

Let x\cdot y = 18, we get an additional equation by implicit differentiation:

x\cdot \frac{dy}{dt}+y\cdot \frac{dx}{dt} = 0 (1)

From the first equation we find that:

x = \frac{18}{y} (2)

By applying (2) in (1), we get the resulting expression:

\frac{18}{y}\cdot \frac{dy}{dt}+y\cdot \frac{dx}{dt} = 0 (3)

y\cdot \frac{dx}{dt}=-\frac{18}{y}\cdot \frac{dy}{dt}

\frac{dx}{dt} = -\frac{18}{y^{2}} \cdot \frac{dy}{dt}

If we know that y = 6 and \frac{dy}{dt} = 8, then the first derivative of x in time is:

\frac{dx}{dt} = -\frac{18}{6^{2}} \cdot (8)

\frac{dx}{dt} = -4

From (1) we determine the value of x at this instant:

x\cdot \frac{dy}{dt} = -y\cdot \frac{dx}{dt}

x = -y\cdot \left(\frac{\frac{dx}{dt} }{\frac{dy}{dt} } \right)

x = -6\cdot \left(\frac{-4}{8} \right)

x = 3

The value of x at this instant is 3.

4 0
3 years ago
Need help again...<br> :(
agasfer [191]

Answer:

21

Step-by-step explanation:

I think your suppose to find the greatest common factor

5 0
3 years ago
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