What are the next three triangular numbers, 1, 3, 6, 10

Pick the expression that matches this description: a polynomial of the 5th degree with a leading coefficient of 7 and a constant term of 6 (choice a) 7x^5+2x^2+6 (choice b) 7x^6−6x^4+5 (choice c) 6x^7−x^5+5 (choice d) 6x^5+x^4+7

Which number completes the system of linear inequalities represented by the graph? y > 2x – 2 and x + 4y >

Will positive numbers always have a higher absolute value than negative numbers?