Use substitution to solve the system of equations. Which letter choice is the answer?

y = 4.5x + 7.5

y = - 3.5x - 4.5

A. x = - 1.5, y = - 0.75

B. x = 1.5, y = 0.75

C. x = 1.5, y = - 0.75

D. x = - 1.5, y = 0.75

Write a quadratic equation whose solutions are - 1/3 and 4

Simplify the expression: x2 + x (x - 5) - x + 7 a. 2x2 - 6x + 7 b. x3 - 5x + 7 c. 6x2 - x + 7 d. - 5x2 - x + 7

Use the data set to answer the question. {122,132,155,198,213,225,261,280} What is the mean absolute deviation for the data set? Enter your answer as a number rounded to the nearest tenth, like this: 42.5

Is 25% of a whole always the same amount?

Compute (a) Δ y and (b) dy for the given values of x and dx=Δx y=9-x^2, x=-2,Δx=.4

What is 75% of 420 minutes?

A student club has 15 members. How many ways can a committee of 6 members be chosen? A. 504 B. 720 C. 5,005 D. 3,603,600

Round 188.84 to the nearest tenth

How do you do two step inequalities

4. A textbook has 428 pages numbered in order starting with 1. You flip to a random page in the book in a way that it is equally likely to stop at any of the pages. a. What is the sample space for this experiment? b.