Atextbook store sold a combined total of 327 psychology and history textbooks in a week. the number of history textbooks sold was 75 less than the number of psychology textbooks sold. how many textbooks of each type were sold?

201 psychology textbooks

126 history textbooks

Step-by-step explanation:

We let the number of psychology books be p, and

number of history books be h

Thus we can write 2 equations as:

1. p + h = 327

2. p - 75 = h

Now, we put equaiton 2 into equation 1 and solve for p first:

p + h = 327

p + (p-75) = 327

2p = 327 + 75

2p = 402

p = 402/2 = 201

So, 201 psychology textbooks. Now, we know p - 75 = h, hence

201 - 75 = h

h = 126

So, 126 history textbooks

srry idk

step-by-step explanation:

whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.