Dave is comparing the circumferences of several trees in his yard. the oak tree is 0.539 meters in circumference, the ash tree has a circumference of 0.509 yards, the elm tree is 6281.70 millimeters around, and the poplar has a circumference of 0.000385 miles. there are 30.48 centimeters in a foot. which tree has the greatest circumference?

a. oak

b. ash

c. elm

d. poplar

Option C. Elm tree has the greatest circumference.

Step-by-step explanation:

Dave is comparing the circumferences of several trees in his yard.

He has given the circumferences of the trees in different units, so first we convert all the same units.

Circumference of  Oak tree = 0.539 meters

1 meter = 100 centimeters or 3.28 feet

0.539 meter = 53.9 cm or  1.768 feet

Circumference of ash tree = 0.509 yards

1 yard = 91.44 centimeter or 3 feet

0.509 yards = 46.54 cm or 1.527 feet

Circumference of elm tree = 6281.70 millimeters

1 millimeter = 0.1 centimeter or 0.00328084 foot

6281.70 mm = 628.17 cm or 20.609252 feet

Circumference of Poplar tree = 0.000385 miles.

1 mile = 160934 centimeters or 5280 feet

0.000385 miles = 61.9597 cm or 2.0328 feet

Elm tree has the greatest circumference 628.17 cm. or 20.61 feet.

b. 24 mm

step-by-step explanation:

use the pythagorean theorem.

a^2 + b^2 = c^2

a^2 + 7^2 = 25^2

a^2 + 49 = 625

a^2 = 576

a = 24

answer: b. 24 mm

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