Use the formula for the sum of the first n integers to evaluate the sum given below, then write it in closed form. (For each answer, enter a mathematical expression.) (a) 6 + 7 + 8 + 9 + ⋯ + 600   (b) 6 + 7 + 8 + 9 + ⋯ + k

Perform the indicated operations. Let k be a natural number. (a) (-1)6 (b) (-1)73 (c) (-1)2019 (d) (-1)2k (e) (-1)2k + 1 (f) (-1)2k - 1 Need Help? Read It

Plumber J charges a flat fee of $55 plus $40 per hour. Plumber B charges a flat fee of $35 plus $45 per hour. What is the expressions for each? what job lenghts will be the same amount? what jobs will J charge more?

Simplify the expression. (a) 4a3 + Va (b) V81x + Vx7

In the following, it is possible that one of the properties of the real numbers has been applied incorrectly. Identify the property being applied. If the statement is incorrect, enter the corrected right hand side. Otherwise, enter CORRECT in the remaining blank. 2a − 4b = 4b − 2a Distributive Property Commutative Property of Addition     Commutative Property of Multiplication Associative Property of Multiplication Associative Property of Addition 2a − 4b

æ(x + 9) (a + 6)(x + 4) 9. Subtract and simplify: x + 6 Submit Question Previous