Ravi has some money. If he buys 40 doughnuts, he will have $5 left. If he buys 50 doughnuts, he will need another $15. How much does one doughnut cost?

If a seed is planted, it has a 60% chance of growing into a healthy plant. If 10 seeds are planted, what is the probability that exactly 1 doesn't grow? (round to 4 decimal places)

Part of a book fell out. The first page of this part has number 143. The last page has a number written with the same digits. How many pages are in the part of the book which has fallen out?

Melissa's box has 5 numbered pool balls and David's box has 3 numbered pool balls. Melissa randomly picks one ball from her box. David randomly picks one ball from his box. whoever picks the highest numbered pool ball wins.

Jermey drew a polygon with four right angles and four sides with the same length. Name all the polygons that he could have drawn

A right regular hexagonal prism has a height of 5 cm. The area of the base is 93.6 square centimeters and the length of one side of its base is 6 cm. Find the total surface area to the nearest tenth.

Which best describes a way in which Naturalism differs from Realism? A. Characters are idealized. B. The effect of society and heredity on character is explored. C. The importance of nature is emphasized over that of humanity. D.

Find the equation of the line that cuts the y axis at y=-9 and whose slope is 1/7.

Math is often used to determine the correct dosage for medications; create scale drawings; graph data from scientific investigations. Given this information, what conclusion can be made about mathematics? A.

A car is 200 km from its destination after 1 hour and 80 km from its destination after 3 hours.

Consider the equation x-3=5. a. Multiply both sides of the equation by a constant, and show that the solution set did not change. Now, multiply both sides by x. b. Show that x=8 is still a solution to the new equation.