Answer:

Step-by-step explanation:
If y varies directly as x, then we can write the relation

where k is the constant of proportionality.
We substitute y=-319 when x=29.

This implies that:


The variation equation now becomes

Use the quadractic formula
Answer:
b > 100
Step-by-step explanation:
This is how you set up a percent of error proportion:
<u>Amount of error</u> <u>x(Unknown percent)</u>
Actual value = 100(Percents are out of hundreds)
So if you fill it in, it becomes <u>4</u> <u>x
</u> 80 =100
Cross multiply, 400= 80x.
Solve.
x=5 so percent error is 5%<u>
</u>