With the decimal points, the first digit after the decimal starts out as tenths, and numbers above 5 are rounded up, so keeping those 2 facts in mind the answer would be
11.36
9514 1404 393
Answer:
base: 12 in
altitude: 7 in
Step-by-step explanation:
The formula for the area of a triangle is ...
A = 1/2bh
Filling in the given information, we have ...
42 = 1/2(b)(b -5)
b^2 -5b -84 = 0 . . . . multiply by 2, put in standard form
(b -12)(b +7) = 0 . . . . factor
The only positive solution is b = 12
The base is 12 inches; the altitude is 7 inches.
Brian-90×5+85=535
Christina-90×5+65=515
So after 5 weeks Brian will do 535 push ups and Christina will have done 515.
