0.8 - 0.5 : 5 + 0.2 (i know the answer is 0.9. i need to know how to get that. as by what i'm doing i keep getting 0.5. tia)

Bea is building a 1:120 scale model of a museum building. Her model has a rectangular base that is 3 feet wide and 2 feet long. What is the area of the base of the actual museum in square feet?

How many times greater is 30.479 x 10^7 than 210.2 x 10^4? answer in scientific notation

Nell made a secret code. Each code word has 2 letters. Each word begins with a consonant and ends with a vowel. How many code words can Nell make with 3 consonants and 2 vowels?

Oh 9i is a root of the polynomial function f (x), which of the following must also be a root of f (x) ? A. - 9i B. - 1/9i C. 1/9i D. 9 - i

Emma, Ella, and Anna are taking a trip to the beach. Anna has $45 to spend on food, and Emma has $18 less than Anna, Ella has $6 more than Anna. Sara decides to go on the trip, too. She takes $10 less than Ella.

Evaluate the expression xy for x=7 and y=5

Why has Europe conducted so much trade and exploration

The maturity value of a $16,000 non-interest-bearing, simple discount 6%, 60-day note is:

What minus 5 equals 1

6x - 24 what is it equivalent to