Mario computes the circumference of his 15” wide bicycle tire as 23.55 inches. what was his error? he squared the radius instead of doubling it. he used the radius instead the diameter. he multiplied the diameter and radius in the formula. he multiplied by the diameter instead of the radius.

(b) He used the radius instead the diameter.

Formulae to calculate the circumference of the tire is = π × d.

where π is 22/7 and d is 15.

Step-by-step explanation:

when we calculate the circumference the answer will be

π × d =22/7 x 15 = 47.1

while the answer Mario computes is 23.55 inches.

Thus the error occurs in the formulae that are, Mario multiplies with the radius instead of diameter.

π × d/2 = 22/7 x 15/2 = 23.55

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.

i believe that the answer is

b. y-1=-2(x-4)

hope this !