Hello!
When you use sum you add
-2.1x + 3.7 + 5 + 4.9x
Now you add the variables and the constants
-2.1x + 4.9x = 2.8x
3.7 + 5 = 8.7
Combine the two
2.8x + 8.7
The answer is 2.8x + 8.7
Hope this helps!
I think you substitute 189 for the letter t.
You actually do substitute.
Answer:
Step-by-step explanation:
Assuming the maximum score for the final is 
, we can multiply each score by its respective course weight and add them together to give a final score. If your friend did receive this maximum score of , their overall grade for the course would be:
.
To find the minimum score they need to earn a 75% for the course, we set up the following equation:
, where 
is the minimum score she needs.
Solving, we get:
.
The work done has the formula
W = F d
where the force and the displacement have the same direction
We can determine displacement using the distance formula
d = √[(5 - 0)² + (-1 - 4)²]
d = 5√2
Next, the force along the direction of the displacement must be determined
Use trigonometry to determine the angle θ
Finally, the work is calculated using the formula
W = F d / cos θ
substitute the values to get the answer
