The cost of a piece of ribbon is directly proportional to the length of the ribbon. The cost of 8 yards of ribbon (without tax) is $5.60. The sales tax rate is 6.35%. What does it cost for 10 yards of ribbon, including tax?

$7.44

Step-by-step explanation:

The cost of a piece of ribbon is directly proportional to the length of the ribbon.

A yard is therefore:

= 5.60/8

= $0.70

10 yards will cost:

= 0.70 * 10

= $7.00

Including sales tax:

= 7.00 * (1 + 6.35%)

= $7.44

step-by-step explanation:

my butt

the formula of a slope:

from a table we have

substitute:

the slope of f(x) is -1.

the graph of funcfion g(x) is a horizontal line. the slope of a horizontal line is equal 0. therefore the slope of g(x) is 0.

-1 < 0