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Andre45 [30]
3 years ago
11

What is an written expression for 20+5×9

Mathematics
1 answer:
BartSMP [9]3 years ago
7 0

Answer:

Five times nine plus twenty

Step-by-step explanation:

Just remember the order of operations... multiplication and division are done first before adding and subtracting.

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Select the statement which is true about the functions over the interval [1, 2].
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Step-by-step explanation:

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Question : -6+(-6)+(-6)
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4x2 + 9y2 = 72 x - y2 = -1 Select all of the following that are solutions to the system shown.
Wittaler [7]
You haven't listed the possible solutions, so in the immediate present I can help only by suggesting that you try solving this system and checking your own answers thru subst. into the given equations.

Please be sure to use "^" to indicate exponentiation, as shown below:

<span>4x2 + 9y2 = 72    should be 4x^2 + 9y^2 = 72 (this is the eq'n of an ellipse)
x - y2 = -1       should be x - y^2 = -1 (this is the equation of a parabola)

We must eliminate either x or y.  I will solve the 2nd equation for y^2 and subst. the result into the first eq'n.:

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</span>4x^2 + 9y^2 = 72 becomes 4x^2 + 9(x+1) = 72.

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We must solve this quadratic equation to obtain the x-coordinates of possible solutions of the original system of equations.
                                                   -9 plus or minus 33
After some work, we get    x = ------------------------------
                                                                 8

So x = 24/8 = 3, or   x = -42/8   =   -5 1/4  or   -21/4

Check out x=3.  We already have the relationship   y^2 = x+1.  If x = 3, then y^2 = 3+1 = 4, and y is plus or minus 2.

Two possible solutions of the original set of equations are thus (3,2) and (3,-2).  You MUST check both solutions thru substitution to determine whether they satisfy the original equations or not.
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C(x)=85x+600 find C(25)
Komok [63]

Answer:

Step-by-step explanation:

c(25) = 85(25) + 600 = 2725

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3 years ago
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