Solve this system of equations using substitution.

a + b + c = 180

b = 3a

c = 5a

X varies directly as y. If x is 9 when y is 4, find x when y is 8. a) Write the variation. b) Find x when y is 8.

Bob spent $37.80, including tax, on a pair of jeans. How much did the jeans cost if there was 8% sales tax?

Ronald rolled a number cube 50 times. During these trials he rolled the number 5 a total of 7 times. Based on these trials, what is the probability of rolling a 5? Does this represent a theoretical or experimental probability? Explain.

The center of a circle is at (-2, - 7) and its radius is 6. What is the equation of the circle? A. (x-2) 2 + (y-7) 2=3 B. (x+2) 2 + (y+7) 2=3 C. (x+2) 2 + (y+7) 2=36 D. (x-2) 2 + (y-7) 2=36

Which of the following numbers is prime? 1 2 4 9

Karen and bill collect coins. Karen has x coins. Bill has 3 coins fewer than five times the number of coins Karen has.

Together Xavier, Yolanda, and Zachary have $4.44. if each person has the same amount, how much money does each person have?

Do 6 and 7 have any common factors

Solve this, if u r brilliant ... 1. I am a 11 letter Indian city. 2. Last 6 letters is fruit name. 3. 7,8,3 letters is a bird name ... 4. 6,7,5,3 is a part of the face. 5. 1,8,3 is used by student 6. 9,5,3 is a soap name 101% brain work. Reply.

What is the work for 812 divided by 4 short division