Ruby red paint costs $0.50 per square inch. a ball is painted ruby red and costs $100.00 to paint. what is the diameter of the ball? round to the nearest tenth of an inch.. a.4.0 in.. b.5.6 in.. c.8.0 in.. d.16.0 in.

Option C is the answer.

Step-by-step explanation:

A ball is painted ruby red and costs $100.00 to paint and Ruby red paint costs $0.50 per square inch.

This means for an area of , $100 were used. because the ball is a sphere.

where r is the radius.

We know that , Area of ball * cost of paint per square inch = total cost of paint.

; inch

Radius is 3.99 inches. or we can round this to 4 inches.

Hence, the diameter will be = inches.

Therefore, option C: 8 inches is the answer.

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles