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Sergio [31]
3 years ago
7

Evaluate each expression for the given value of the variables. 2x + y for x= 7 and y = 11​

Mathematics
1 answer:
prisoha [69]3 years ago
4 0

Answer:

25

Step-by-step explanation:

Substitute 7 into 2, and 11 into y.

2(7)+(11)

14+11

25

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104 pounds requires 156 milligrams of medicine what is the weight of a patient who requires 207 milligrams of medicine
Lubov Fominskaja [6]

Answer:

138 pounds

Step-by-step explanation:

Let the required weight of the patient be x pounds.

We have that,

156 milligrams of medicine is required for a patient weighing 104 pounds.

Then, 207 milligrams of medicine will be required for a patient having weight as shown below,

Weight of the patient = \frac{104 \times 207}{156}

i.e. x = \frac{21528}{156}

i.e. x = 138

Hence, the patient needing 207 milligrams of medicine will have the weight 138 pounds.

5 0
3 years ago
How do I solve this?
Nezavi [6.7K]

Answer: 3

Step-by-step explanation: m=2 so 7.5x2 = 15

15/5 is 15 divided by 5 so the answer is 3

7 0
3 years ago
Read 2 more answers
I actually literally dont pay attention alot in class, so i have no clue what this means, any help?
kaheart [24]

Answer:

pay attention in class

Step-by-step explanation:

936

-3

-------

=312

-------

so its 3.12

6 0
3 years ago
Read 2 more answers
write a divison problem that has a quotient of 3 and a remiander of 28. 2nd question. mrs sliverstein sold 91 cupcakes at a food
dexar [7]
1. 157 ÷ 43 = 3 R 28

2. Mrs. Silverstein received $105, divide 91 by 13 which is 7, them multiply 15 by the quotient, 7, and you'll get 105.
6 0
4 years ago
Read 2 more answers
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.:

y^2 = x+1.  Subst. this into the first equation, 

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

Expanding, 4x^2 + 9x + 9 = 72, or 4x^2 + 9x - 63 = 0

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.
5 0
3 years ago
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