Which set of numbers is closed under subtraction?

Liam and Tehya are trying to determine whether ΔABC and ΔEFD can be proven congruent through rigid motions. Liam says that ΔABC ≅ ΔEFD because ΔABC can be reflected over the y-axis to create ΔEFD.

Find the area of r = 4.5

If a line is perfectly vertical, meaning it reaches all y - at a single x-, which kind of slope does it have? A. Zero B. Undefined C. Negative D. Positive

Find the 90th percentile for the data set: 6283, 5700, 6381, 6274, 5700, 5896, 5972, 6075, 5993, 5581

5. Aaron has sewn three square tablecloths of different sizes. He determines the length of the diagonal of each square tablecloth. Part A The yellow tablecloth has a diagonal of The yellow tablecloth has a diagonal of √18 feet.

For the given arithmetic sequence find the common difference, d. 4, 1.75, - 0.5,-2.75

Is this question true or false 11=√101

Casey has a total of 18 pens. Twelve of these pens are blue, and the rest are red. What is the ratio of blue pens to red pens?

Which of the following is a monomial? A. 2x + yz B. 2xyz2 C. 2x - yz D. 2 + xyz

Written as fractions, the decimal numbers 0.3 and 0.11 are 3/10 and 11/100, respectively