Greta answered 32 out of 40 questions correctly on a spelling test. what percentage of the words did she answer incorrectly?

20%

Step-by-step explanation:

If you divide 32 out of 40, you will get .8. Multiply that by 100 and you will get 80%. The question asks for the percentage of incorrect ones, so subtract 80 out of 100 and you will get 20%.

She got 20% of the words incorrect.

b. 153 students do not participate in sports and seventy-five 12th graders were surveyed

answer: 33 ( approx)

step-by-step explanation:

since, in the linear regression formula, the slope is the a in the equation y = b + ax ( by comparing it with the general equation of line y = mx + c )

where,

here given table is,

price ($), x   :           18         23       25       29       30       33

pairs sold, y :         16         13         10       8         6       2

so, ,   ,   ,

and   ,

thus, slop of the given line is,

⇒  

⇒   ≈ 33