be, mg, ca, sr which of the following about the elements is true?

a. all of them are unreactive metalloids.

b. all of them are hard and dense metals.

c. be and mg are hard and dense metals and ca and sr are unreactive metalloids.

d. be and mg are unreactive metalloids and ca and sr are hard and dense metals.

Josh has a rewards card for a movie theater he receives 15 points for becoming a rewards card holder he earns 3.5 points for each visit to the movie theater he needs at least 55 points to earn a free movie ticket which inequality can josh use to determine x, the minimum number of visits he needs to earn his first free movie ticket.

Rena is building a 1: 180 scale model of a real castle. her model has a rectangular base that is 3 feet wide and 4 feet long what is the area of the base of the actual castle in square feet

Charlie tosses five coins.what is the probability that all five coins will land tails up.