1. Multiply and simplify.
3.xy^4 z^2 . 5x²yx

a. 15(xyz)^11
b. 15x^4y^5z^2
c. 8x^4y^5z^2
d. 15x^2y^4z^2

2. simplify
4x^2 (5x^4 -3x^2 +x-2)
a. -20x^6 + 12x^4 - 4x^3 + 8x^2
b. -20x^8 + 12x^4 - 4x^2 + 8x
c. -20x^6 + 12x^4 + 4x^3 - 8x^2
d. -20x^6 - 12x^4 + 8x^3 -8x^2

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

Billie holiday sells children's clothing for sara vaughn's toddler shop. baby blankets sell for $29.99 after a markup rate based on cost of 109%. find the cost and the markup.

Will mark brainliest for correct answer! i have been on this problem for an hour and can't find the answer. i'm begging here! incase you cant read the instructions in the picture because of too much or too little lighting: note: enter your answer and show all the steps that you use to solve this problem in the space provided.write a list of steps that are needed to find the measure of b. provide all steps as clear as possible, !