Wapi simplified an expression. His work is shown below 7(8.5-1.5)+ 8÷ 2
step 1 7(7) + 8 ÷ 2
step 2 49 + 8 ÷ 2
step 3 57 +2
step 4 28.5

In which step did Wapi make his first mistake?
➪ Step 1
➪ Step 2
➪ Step 3
➪ Step 4

Xto the second power plus 14x plus 48. what are the factors? we are doing factoring trinomials with a=1

1. if we have 3 babies what is the probability they’re going to be all boys? 2. if we roll 2 die at the same time what is the probability of getting less than 10 on the first roll and a 5 on the second roll 3. if we have 3 babies what is the probability their is going to be 2 girls? 4. if we have 3 babies what is the probability of having no more than 1 girl? 5. it we have 3 babies and then have another 3 babies what is the probability of us having at least 1 boy and then having all girls?

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.