In order to complete a reading assignment on time, terry planned to read 90 pages per day. however, she read only 75 pages per day at first, leaving 690 pages to be read during the last 6 days before the assignment was to be completed. how many days in all did terry have to complete the assignment on time?

Say Terry read at the rate of 75 pages per day for d days. 

Now, in d days she read 75d pages, and since after that 690 pages were left, then the number of pages in the book is 75d+690.

Next, we also know that she had d+6 days for the assignment. Since Terry planned to read 90 pages per day for this number of days, then the number of pages in book is also equal to 90(d+6).

So, we have that 75d+690 = 90(d+6). Solving the linear equation, we get d = 10.

Thus, the total number of days that she has to complete the assignment on time is d+6 or 10 + 6 = 16 days.

d. $180

step-by-step explanation:

if the dimensions of the room is 9ft by 12 ft, we have the area of the floor as,

so the area of the floor is 108 square feet, converting that into square yards we get,

the cost of carpet is $15 per square yard, therefore the cost of carpet for 12 square yards is,

hence, the cost of carpet is $180.

assuming the dimensions of the room be,

15 ft by 12 ft

so, the area of the floor of that room is,

we can convert 180 square feet into square yards, we know that,

1 sq ft = 0.111 sq yard

so, 180 square feet is,

so the area of floor is 20 square yards.

now, the cost of carpet is 15 dollars per square yard, therefore the cost of carpet for 20 square yards is,

so, it will cost $300.