Estimate a 15% tip on a dinner bill of $38.65 by first rounding the bill amount to the nearest ten dollars.

$5.81

Step-by-step explanation:

First, we round off the dinner bill of $38.65 to the nearest ten dollars, since 0.65 is greater than 0.5 benchmark for approximation, we round up. Therefore, 38.65 to the nearest tenth means we remove the last digit of the decimal= $38.7

15% tip on a dinner bill of $38.7 =

15/100 × 38.7

0.15 x 38.7= $5.805

.25

step-by-step explanation:

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.