After six biology tests, Ruben has a mean score of 76. What score does Ruben need on the next test to raise his average (mean) to 78?

Alogical argument that is presented in graphical form using boxes and arrows is called?

Hi, can anyone show me how to do this problem? 100 points for this. in advance

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.