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wlad13 [49]
4 years ago
9

The product of a positive number and 14 more than seven times the number is 105. Find the two numbers. first number =______ and

second number =_________
Mathematics
2 answers:
Nostrana [21]4 years ago
8 0
Let the positive number be x

The expression is
x(14+7x)=105⇒ expanding the bracket gives,
14x+7 x^{2} =105 ⇒ rearranging to equate one side to zero
7x^{2} +14x-105=0 ⇒ Dividing each term by 7 to simplify
x^{2} +2x-15 ⇒ Factorising gives
(x+5)(x-3)=0
x=-5 and x=3

Hence, the first number is -5 and the second number is 3

Misha Larkins [42]4 years ago
7 0

Answer:

can you explain it in more depth please

Step-by-step explanation:


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Marizza181 [45]
11% = 0.11
6.5% =0.065
0.26 = 26%
-0.195 = -19.5%
-111 = -11100%
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3 years ago
Expand the following:<br> 1/5 (10x-25)
mario62 [17]
<span>This must be your answer:
Expanded: 1/5 x 10x + 1/5 x -25 </span>
3 0
4 years ago
What is the average of 63 and 148
fgiga [73]

The average is 105.5. To find the average, you have to add up all numbers, 63+148=211. Now you have to divide by how many numbers there are,               211÷2=105.5

8 0
4 years ago
1. Which of the following is a quadratic function?
kotykmax [81]

Answer:

Number 3 and 2

Step-by-step explanation:

you can use desmos to check ur answers

6 0
3 years ago
Given the following probability distribution, what is the expected value of the random variable X? X P(X) 100 .10 150 .20 200 .3
Mekhanik [1.2K]

Answer:

d) 205

Step-by-step explanation:

<u><em>Step(i):-</em></u>

x             :   100      150      200      250      300

p(X=x)    :   0.10     0.20    0.30     0.30      0.10

<u>Step(ii):-</u>

Let 'X' be the discrete random variable

Expected value of the random variable

   E(X) = ∑ x P(X=x)

           =  100 X 0.10 + 150 X 0.20 + 200 X 0.30 +250 X 0.30 + 300 X 0.10

          =   205

<u>Final answer:</u>-

The expected value     E(X) = 205

5 0
4 years ago
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