A4x4 grid with 5 blocks shaded in, i need to write a percent and a ratio for it.
a. 1/5, 25% b. 5/16, 31.2% c. 1/4 , 20% d. 1/4, 25% c? im not really sure on this one, i just need some .

Use set buikder notation to represent the following set: {, -2, -1, 0}

Ametal rod is 2/5 meters long. it will be cut into pieces that are each 1/30 meters long. how many pieces will be made from the rod?

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.