Which change will triple the lateral surface area of a regular triangular pyramid with base length b, height h, and slant height l?

By tripling the base length.

Step-by-step explanation:

The surface area of a regular triangular pyramid is:

By tripling the base length, the surface area of the regular triangular pyramid is tripled.

x=-7

step-by-step explanation:

x+3=-10

-10+3=-7

x=-7

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.