The number of psychological disorders identified by the Diagnostic and Statistical Manual of Mental Disorders has increased from 60 in 1952 to approximately 400 in 2013. Which is the BEST explanation for the increase in the number of psychological disorders

Explanation:

In this scenario, the best explanation for this would be that the number increased drastically due to the large quantity of research that has been done. Since we have been able to differentiate more numbers of psych disorders over the years this leads to a large and drastic increase. Over the years technology has advanced greatly which has allowed us to develop new methods to research the different kinds of diseases that exist.

x = 7

step-by-step explanation:

equating the expression for area to the given area

2x² - 7x - 4 = 45 ( subtract 45 from both sides )

2x² - 7x - 49 = 0 ← in standard form

to factor consider the factors of the product of the coefficient of the x² term and the constant term which sum to give the coefficient of the x- term

product = 2 × - 49 = - 98 and sum = - 7

the factors are - 14 and + 7

use these factors to split the middle term

2x² - 14x + 7x - 49 = 0 ( factor the first/second and third/fourth terms )

2x(x - 7) + 7(x - 7) = 0 ← factor out (x - 7)

(x - 7)(2x + 7) = 0

equate each factor to zero and solve for x

x - 7 = 0 ⇒ x = 7

2x + 7 = 0 ⇒ 2x = - 7 ⇒ x = -

thus the positive value for x is x = 7

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