Answer:
Step-by-step explanation:
Add all the scores you do know
8 + 10 + 38 + 20 = 76
Now put in an ex for the situps.
76 + x
There are 5 subjects
(76 + x) /5 = 18.2
The average was 18.2
Multiply both sides by 5
5*(76 + x ) / 5 = 18.2 * 5
Cancel the left combine the right.
76 + x = 91
Subtract 76 from both sides
76 - 76 + x = 91 - 76
x = 15
15
Call the unknown time x.
The mean is the sum of the numbers divided by the number of numbers.
There are 5 numbers.
(8 + 10 + 38 + x + 20)/5 = 18.2
(x + 76)/5 = 18.2
x + 76 = 91
44
h(-7) means use the expression labeled h and evaluate it for x=-7.
Like this:
(-7)^2 - 5
49 - 5
0.25 feet
7.62 centimeters
3 inches
Not really a clear question-
pretty sure is the first one
a proportional relationship is a straight line that passes through the origin
