can someone check my answers

approximately 4 out of 10 students at sonia's college lives on campaus. the college has 3,000 students . how many live on campus? 1,200

multiply (4)(-3/2)= -6

solve for the unknown 2/3=1.8
10 r
answer 12

The first two are correct. You have made some kind of typing error in the third question. Why is "10 r" on a separate line?

To check your answers, we can go through the steps for each question. Here's how to do it:

1. Question: Approximately 4 out of 10 students at Sonia's college live on campus. The college has 3,000 students. How many live on campus? Your answer is 1,200.

Explanation: To find the number of students living on campus, we need to multiply the total number of students by the fraction that represents the portion living on campus.

Step 1: Calculate the fraction of students living on campus: 4/10 = 0.4.

Step 2: Multiply the fraction by the total number of students to find the number of students living on campus: 0.4 * 3,000 = 1,200.

Your answer of 1,200 is correct!

2. Question: Multiply (4)(-3/2). Your answer is -6.

Explanation: To multiply two numbers, you multiply their values. In this case, you are multiplying 4 and -3/2.

Step 1: Multiply the whole numbers: 4 * (-3) = -12.

Step 2: Multiply the fractions: 1/2 * 3/1 = 3/2.

Step 3: Combine the results from Step 1 and Step 2: -12 * 3/2 = -36/2 = -18.

Your answer of -6 is incorrect. The correct answer is -18.

3. Question: Solve for the unknown in the equation 2/3 = 1.8 / (10/r). Your answer is 12.

Explanation: To solve for the unknown variable, you need to isolate it on one side of the equation.

Step 1: Cross-multiply the fractions: 2 * (10/r) = 1.8 * 3.

Step 2: Simplify the equation and solve for r: 20/r = 5.4.

Step 3: Multiply both sides of the equation by r: 20 = 5.4r.

Step 4: Divide both sides of the equation by 5.4 to solve for r: 20/5.4 = r.

Your answer of 12 is correct! r = 12.

Overall, you had two correct answers and one incorrect answer.