Answer:
-6
Step-by-step explanation:
x=-6
From the given information, a exists jointly proportional to b and c.
then 
Therefore, the value of a exists 2.
<h3>
What is the value of a?</h3>
Given, a exists jointly proportional to b and c.

Taking K as the constant of proportionality.
a = K b c
For b = 8 and c = 9, the value of a = 4
4 = K(8)(9)
4 = 72 K
Dividing the equation by 72, we get

Using the value of K in the equation:

Substitute the values of b = 2 and c = 18, in the above equation

a = 2
Therefore, the value of a exists 2.
To learn more the value of x refers to:
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Because many of the chemical reaction that sustain life
Answer:
$1875.50
Step-by-step explanation:
s = salary; c = car sales
s = 500 + (c × 0.02)
= 500 + (68775 × 0.02)
= 500 + 1375.5
= 1875.5