What is the sum of n natural numbers: 1+2 + ... + n?

What is the answer to - 16-90

john spent 2hours and 55 minutes outside cleaning up his yard. if he started cleaning at 1:10, what time was it when John finished?

Jerome bought a book on sale at the store. The sale of the book was 8.96

Simplify the given expression below: (3 + 4i) + (5 - 2i) -2 + 6i 2 - 2i 7 + 3i 8 + 2i

Which is bigger 1/4 of 16th or 1/3 a 24

Zack flips a coin and rolls a numbet cube with side labeled 1 to 6. What is the propability that he gets heads and a number greater than 4?

Find the area of a 120° sector of a circle whose radius is 6.

Find the product 2 5/8 x 1 1/7 then write in simplest form

Suppose you wish to test if a number cube (die) is loaded or not. if the die is not loaded, the theoretical probabilities for each roll should be:

Peppermint patty is very discourged about her chances on a 10-item true-false quiz. if she randomly answers each question, what is her probability of getting a grade of at least 50% on a Two item quiz? Three item quiz? Four item quiz? Five item quiz?