Is this set closed or not closed under the operation? Negative integers under multiplication

Write an inequality to compare - 21 and - 13. which temperature is warmer?

14+12=-15x+2x solve for it

The law of sines states that if a triangle with sides a, b, and c, then the following is true. In order to prove the law of sines, what must first be constructed in triangle ABC? A. a medium of triangle ABC B.

Questions 6 to 10 are related. based on a random sample of n=15 observations, we have obtained a sample mean of x (bar) = 1050. the goal is to test: h (0) : μ≤1000 and h (a) : μ>1000 assume that x is normally distributed with σ=150.

Which linear equation represents a non-proportional relationship? A) y = 0.2x. B) y = 1/2x, C) y = - 1/2x, y = - 1/2x + 5

UT bisects WV. WV = ? A. SV B. 2 (SV) C. UT D. none of the above

Evaluate 2/3 - 1/6. a. 1/6 b. 1/2 c. 5/6 d. 1

15%of $30 as a decimal

The ordered pairs model an exponential function, where j is the function name and e is the input variable. { (1, 10), (2, 50), (3, 250), (4, 1250) } What is the function equation in sequence notation?

Simply and reduce to lowest terms a + [a + b - a - (2a - b) ]