Simplify each expression. Justify each step.

4 (x + 9) + 5x

What is the true solution to ln 20 + ln 5 = 2 ln x? x=5 x=10 x=50 x=100

Chana pays $7.35 per pound for up to 19 pounds of beads. For more than 19 pounds, she pays $5.35 per pound. Is the amount Chana pays a function of the weight of the beads she buys? Explain your reasoning.

At 9:00 A. M. It was - 8º F. At 3:00 P. M. the temperature was 10º F. Which expression shows how to find the average increase per hour in temperature? [10 - (-8) ]:6 [10 + (-8) ]:6 6: (-8+10) 6:[-8 - (-10) ]

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. If Tim's phone bill was $31.64, which equation could be used to find how many text messages, x, Tim sent last month?

Substitution: y=6x-11 -2x-3y=-7

What is the value of 35-3m, when m = 4? A. 1 B. 13 C. 23 D. 128

A Product What is the product of 4.01 x 10-5 and 2.56 x108?

True or false the number 0 is the multiplicative identity?

What's joint frequency?

How do you solve 235+123 using a number line?