I NEED THIS ASAP!!

Mr. Williams is struggling in German and really wants to do well fourth quarter so that his overall average for the school year is a 65%. First quarter he earned a 58%, second quarter he earned a 68%, and third quarter he earned a 67%. What grade must Mr. Williams earn fourth quarter to have an overall average of 65% for the four quarters?

65%
66%
67%
68%

Find the vertex of the function given below y=x^2-6x+1

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.

An account with a $250 balance accrues 2% annually. if no deposits or withdrawals are made, which graph can be used to determine approximately how many years will it take for the balance to be $282? it's e2020 ni️️as