A quality control technician samples circuit boards and records the number that are defective. Of 240 boards sampled, 8 are found to be defective. The technician reports that 30% of the boards are defective, based on the following work: Which best explains any error the technician may have made?

- There is no error. The technician’s calculations are correct.
- The technician divided in an incorrect order.
- The technician did not convert the answer to a decimal.
- The technician’s sample was not large enough to convert to a percentage.
- The technician did not multiply the answer by 100 to convert it to a percentage.

answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11

what

answer: (-8,4) are the coordinates of a

step-by-step explanation:

let the side of square abcd is x .

thus the area of square abcd is .

now, by the diagram area of triangle ead= 1/2 × ea × ad = 1/2 × ea × x

( because ad is the side of square)

and, according to the question,

the areas of square abcd and right ead are equal.

⇒

⇒ea=2x

thus, ea: ab=2: 1

therefore, point a divides line segment eb into the ratio 2: 1.

⇒ by sectional formula coordinates of a are,

=

=

=(-8, 4)

thus the coordinates of a are (-8,4)

the answer is c hope this