Her homework is 67/100 done
The initial fee is the base, so that will not change.
Without knowing how many miles you're going you need x to substitute them, so the equation would be (using slope intercept form)
y= 1.68x + 2.15
It's 93.
simple calculate it by:
(76+68+83+x)/4=80
then 73*5-(67+75+73+69)=x
where x here is the grade needed to reach an av. of 80. 4 is the number of tests.
*common answer*
It depends on if the ocean floor is cold or warm or freezing maybe below 0°
