Expand and simplify 5(2y+1)^2 -4

20y² + 20y + 1

Step-by-step explanation:

Given

5(2y + 1)² - 4 ← expand the factor using FOIL

= 5(4y² + 4y + 1) - 4 ← distribute parenthesis by 5

= 20y² + 20y + 5 - 4

= 20y² + 20y + 1

a

step-by-step explanation:

strong negative correlation

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.