Problem 4.4. consider the real function f(r) = r2 - 1. calculate each of the following. (1) the image/value of 5 under f. (2) all the pre-images of 15 under f, if they exist. (3) all the arguments associated with the value 20, if they exist. (4) all the pre-images of -10 under f, if they exist. hint. this is straight forward. just be careful with the terminologies. c..d.. th falloninga olaim ae wall ae tha "nronf

the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

: )

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.