Which of the following statements must be true in order for the line represented by the equation y = mx + b to have a negative x-intercept? the signs of the values of m and b are the same. the value of m is positive while the value of b is negative. the value of m is negative while the value of b is positive. the signs of the values of m and b do not affect the sign of the x-intercept.

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis. 3- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in part b?

Si la base de un triángulo isósceles mide 70 m y el ángulo opuesto a ésta mide 58°; entonces ¿cuánto mide la altura de dicho triángulo? a) 21.87 m. b) 40.01 m. c) 43.74 m. d) 63.14 m.

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?