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Olegator [25]
3 years ago
11

The temperature on a summer afternoon is 85°F. Define a variable and write an expression to find the temperature after it change

s. Then evaluate your expression for a decrease of 11 degrees Fahrenheit
Mathematics
2 answers:
JulijaS [17]3 years ago
8 0
A variable a letter to represent a unknown number. 

85-x


85-11=74
Volgvan3 years ago
4 0

Answer:

85 + c; 85 + (–11) = 74; 74°F

Step-by-step explanation:

Math ._.

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Juan wishes to build a garden at the bottom of his property. He wants to split it in two, like the diagram below, so he can plan
SCORPION-xisa [38]

Answer:

20 ft by 60 ft

Step-by-step explanation:

"What should the dimensions of the garden be to maximize this area?"

If y is the length of the garden, parallel to the stream, and x is the width of the garden, then the amount of fencing is:

120 = 3x + y

And the area is:

A = xy

Use substitution:

A = x (120 − 3x)

A = -3x² + 120x

This is a downward facing parabola.  The maximum is at the vertex, which we can find using x = -b/(2a).

x = -120 / (2 · -3)

x = 20

When x = 20, y = 60.  So the garden should be 20 ft by 60 ft.

4 0
3 years ago
-13x=90-2y <br> -6x=48-2y
Kisachek [45]

While it's pretty obvious to most of us that


-13x=90-2y

-6x=48-2y


is a system of linear equations, it'd be well to include that info plus the instructions "solve this system of linear equations."


Subtract the 2nd equation from the first:


-13x=90-2y

+6x=-48+2y

-----------------------

-7x = 42. Then x = -42/7, or x = 6.


Now subst. 6 for x in either one of the given equations. Suppose we use the 2nd equation:


-6x=48-2y


Then -6(6)=48-2y, or -36 = 48 - 2y, or 2y = 48+ 36 = 84. Then y = 42.


The solution is (6, 42).

3 0
2 years ago
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Answer:

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Step-by-step explanation:

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Dmitry_Shevchenko [17]

Answer:

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Step-by-step explanation:

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Please be more specific and what are the measurements as in height and radius or diameter.

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