6identical toys weigh 1.8 kg how much would 1 toy weigh using grams

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

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.

Ming says that 0.24 > 1/4 because 0.24= 2/4. which best explains mings error