Which shows the number 380,000,000 in scientific notation

A researcher obtained a random sample of 100 smokers and a random sample of 100 non-smokers. After interviewing all 200 participants, the researcher compared the rates of depression between the two groups. This study design would be considered:

What would be the answer or how do I solve (x) : 9x

Seventy five percent of the students in sixth grade voted to to the planiterium on their field trip if 24 voted to go to the planiterium, how many students are there in the sixth grade?

Under which of the following operations are the polynomials 8a 14 and 3b - 9 not closed? a. subtraction b. multiplication c. addition d. division

Kendra bought four boxes of donuts they were six donuts in each box she divided the donuts equally among eight people how many donuts to each person receive

Eight hundred thousand, six hundred twenty four in number form

Marcy bought 10.32 pounds of white potatoes and 12.48 pounds of sweet potatoes. About how many pounds of potatoes did Marcy buy? Round each weight to the nearest tenth to estimate the total weight of potatoes that Marcy bought.

Let X = {5, 10, 15, 20, 25, 30, 35, 40}. Define a relation on X as follows. For a, b is in X, a b if b can be obtained from a by adding a (possibly empty) collection of dimes (10 cents) and quarters (25 cents). So, for example, 25 35, but 25 30.

Lindell ran 5 kilometers in 25 minutes. How fast did he run in miles per hour?

If f (x) = x^2+9x and g (x) = 1/x, find f (g (-1)).