Answer:
Mean of boiling times = 26.9 seconds
Step-by-step explanation:
Times ella recorded are given as;
24.5 seconds, 23.2 seconds, 29.8 seconds, and 30.1 seconds.
Now, we want to find the mean of these boiling times.
Formula for mean is;
Mean = sum of terms/number of terms
In this question,
number of terms = 4
Sum of terms = 24.5 + 23.2 + 29.8 + 30.1 = 107.6
Thus,
Mean = 107.6/4
Mean = 26.9 seconds
Answer:
the answer is option B). quintic trinomial
I believe 3-4 ships took part in the battle
Answer:

Step-by-step explanation:
For the surface area we need to add up all the areas in the pyramid:
- area of the triangle sides (there are 4 triangles)
Area of the base:
the base is a square, and the area of a square is given by:

where
is the length of the side:
, thus:

Area of the triangles:
one triangle has the area given by the formula:

where
is the base of the triangle: 
and
is the height of the triangle:
, thus we have the following:

the expression that represents the surface area of the pyramid is:

substituting our values:

which is option B