Suppose a laboratory has 26g sample of polonium-210. The half life of polonium is about 138 days. how many half lives of polonium 210 occur in 276 days? How much polonium is is in the sample 276 days later?

Ali has 3 different coins 10p, 50p and £1. He choose one, two or three of the coins. Write down all the amounts of money he could make.

A single die rolled one time find the probability of rolling an even number or a number less than 5

The diameter of Earth is 1.27 * 10 4 km. The diameter of Mars is 6.79 * 10 3 km. How many times greater is Earth's diameter compared than Mars's diameter? 5.52 * 10 4 5.35 1.9 0.18

What is 6.9 as a fraction or a mixed number

Find The Unit rate Three medium apples have about 285 calories

A gardener uses a tray of 6 conical pots to plant seeds. each conical pot has a radius of 3 centimeters and a depth of 8 centimeters. about how many cubic centimeters of soil are needed to plant the full tray? round to the nearest cubic centimeter.

The price of 2 bananas are $1.00. How much would 7 bananas cost?

students' scores on an anthropology test have a mean of 31 with a standard deviation of 3.5 if rochelle scores 20 on her test, how many standard deviations away from the mean is her score

A gardener is planting two types of trees: Type A is 8 feet tall and grows at a rate of 6 inches per year. Type B is 10 feet tall and grows at a rate of 4 inches per year.

You have a $500 public relations budget for the current year. You would like to generate publicity by publishing several ads in the local township newspaper about your store's sponsorship of community activities.