Make sure to give an explanation for each of them! Directions: Read each statement and determine whether the two variables are positively correlated(P), negatively correlated (N), or contain zero/no correlation (Z). Explain why you chose the answer that you did.

1. In May of last year, the number of classes Marty missed rose from 35 to 50. When grades were reported in June, Marty’s grades had dropped from A’s and B’s to D’s and F’s.

2. Elizabeth increased her practice time for the mile run from five days a week to seven days a week. After practicing, her time improved

3. A scientist wanted to conduct a study that showed the relationship between a person’s performance on a facial recognition test and a person’s height. He had a hard time conducting this experiment and showing a relationship.

5. Dillon studied very hard for his marine bio exam. His grades went up.

i think its 100

i hope this !

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.