The table shows the cost for ordering a certain number of tacos what is the values of x if the cost is proportional to the number of tacos ordered?

9514 1404 393

  9. x = $7.80

  10. 440 miles

Step-by-step explanation:

9. The relationship is proportional. Each taco costs $2.60/2 = $1.30. The cost of 6 tacos can be found by doubling the cost of 3 tacos:

  x = 6-taco cost = 2 × 3-taco cost = 2 × $3.90

  x = $7.80

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10. Apparently, we're to assume that miles driven is proportional to gallons used. Then we can drive m miles on 20 gallons of gas, where ...

  m/20 = 330/15

  m = (20/15)(330) = (4/3)(330)

  m = 440

440 miles can be driven on 20 gallons of gas.

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

step-by-step explanation:

given that ab is divided into equal parts as

ac, cd, de, ef, fg, gh, hi, ib.

from this we find that f is the midpoint of ab.

so using mid point formula we find

f = (3,7)

similarly considering fb, we get

h = mid point of fb = ((6,6) and g, mid point of fh is

g = (9/2, 13/2)

i is mid point of hb

so i =(15/2,11/2)