Radius is half of the diameter so it's 7 for the diameter.
(18-7x)+1= -9 Hope this helps ^^
3x92 = 276 (first 3 exams)
average of at least 90 (90 x 4 = 360)
360 - 276 = 84
Answer
<span>she needs to score at least 84 on the fourth exam </span><span>in order to guarantee a final average of at least 90</span>
There are many like
1(10)+10-1=19
18+1=19
30-11=19
15+4=19
Hope this help!!
