Which one is not correctly spelt a. wellcome b. receipt c. receive d. grammar ?

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

Fred has a spinner that is split into four equal sections: red, blue, green, and yellow. fred spun the spinner 688 times. which of the following would be a good estimate of the number of times the spinner lands on the green section? a. 269 b. 603 c. 344 d. 189

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years