Answer:
y=6,95x+35
Step-by-step explanation:
y=6,95x+35
y=6,95*5+35=69,75 for 5 hours
for 6 hours y=76,7
for 7 hours y=83.65
for 8 hours y=90,6
lemme know if its right <3.
well 7-6 is one then you'll find common demonstrators with the fractions then simplify them then subtract them to get 1 1/4
This is an aritmetic series;
a=-10
d=-7--10
d=3
n= 7
Sum=

(2a+(n-1)d)
Sum=

sum=3.5(-20+18)
sum=3.5(-2)
sum=-7