Ascientist is measuring the temperature change in a chemical
compound. the temperature dropped 11 °f per hour from the
original temperature. after 4 hours, the temperature was
90 °f. find the compound's original temperature.

Rachel reads 1/5 of the pages of a book plus 12 pages on the first day. on the second day, she reads 1/4 of the remaining pages plus 15 pages. on the third day, she reads 1/3 of the remaining pages plus 18 pages. on the fourth day, she reads the remaining 70 pages. how many total pages are in the book?

Urgent? will give brainliest to the first correct answer what is the area of the figure?

Find the center of the circle that can be circumscribed about efg with e(4,4) f(4,2) g(8,2)