Error analysis - describe the error in a sentence or two. then, solve the problem correctly.
13.
if f(x) = 2x - 1. then find the x-value so that f(x) = 21.

f(21) = 2(21-1
f(21) = 42-1
f(21) = 41

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.

don't report but were is the digram

step-by-step explanation: