) Determine whether the normal sampling distribution can be used. The claim is p > 0.25 and the sample size is n

No

Step-by-step explanation:

Since in the question it is mentioned that the p > 0.25 and the sample size is 18 so here the normal sampling distribution is not used as the sample size is very small and as per the central limit theorem, the sampling distribution of any type of independent variable would be normal also the sample size of 30 would be considered as a large

Therefore it should not be used

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

8+10

step-by-step explanation:

you multiply 4 by 2 and 5 by 2