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marusya05 [52]
3 years ago
12

What is the value of c such that: x2 + 14x + c, is a perfect-square trinomial?

Mathematics
1 answer:
kkurt [141]3 years ago
3 0
Take 1/2 of linear coefient and square it
14/2=7
7^2=49
c=49
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la empresa Delta Energy cobra a sus consumidores de energía eléctrica una tarifa de $5 por mes más $0,10 por cada kilowatt-hora.
Iteru [2.4K]

Answer:

C=0,10E+5

Step-by-step explanation:

La respuesta es que la expresión que indica el costo mensual "C" en función de la energía "E" consumida es:

C=0,10E+5

Esto teniendo en cuenta que se indica que hay una tarifa fija de $5 por mes y que a esto se debe sumar el resultado de multiplicar la energía consumida por el valor del kilowatt-hora.

3 0
3 years ago
A 2-gallon jug of juice costs $10.88. What is the price per cup?
Elodia [21]

Answer:

it's ¢.34

Step-by-step explanation:

a gallon has 16 cups

since there are two gallons that's 32

the price of the two gallons divided my 32 is how much each cup would be so 10.88/32 would be ¢.34

3 0
3 years ago
If Karri takes a 7 question true false test and guess on every question, what is the
dusya [7]

Answer:

The  probability that she gets all 7 questions correct is 0.0078.

Step-by-step explanation:

We are given that Karri takes a 7 question true-false test and guess on every question.

The above situation can be represented through binomial distribution;

P(X = r) = \binom{n}{r} \times p^{r} \times (1-p)^{n-r} ; x = 0,1,2,3,........        

where, n = number of samples (trials) taken = 7 question

            r = number of success = all 7 questions correct

            p = probability of success which in our question is probability that

                   question is correct, i.e. p = 50%

Let X = <u><em>Number of question that are correct</em></u>

So, X ~ Binom(n = 7, p = 0.50)

Now, the  probability that she gets all 7 questions correct is given by = P(X = 7)

         P(X = 7)  =  \binom{7}{7} \times 0.50^{7} \times (1-0.50)^{7-7}

                        =  1 \times 0.50^{7} \times 0.50^{0}

                        =  <u>0.0078</u>

6 0
3 years ago
Simplify each expression. -4x + 1 + 6 - (-9x)
IceJOKER [234]

Step-by-step explanation:

-4x+1+6-(-9x)

-4x+7-(-9x)

5x+7

7 0
2 years ago
Which of the following numbers is rational but not an integer? 3, 0, -4.3, -9
skad [1K]

-4.3 is rational but not an intiger

4 0
3 years ago
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