Answer:
9.8%
Step-by-step explanation:
Given the following information

Total Number of Students =6+4+5+7+10+9=41
Number of Students aged 19-22 =4
Therefore:
The relative frequency for the class with a lower class limit of 19

20 because 70+10=80 add 10 more it's 90 genius.
Answer:
infinitely many solutions
Step-by-step explanation:
1) distribute 9 to each term inside parenthesis on left side of equation
18x+90=2(9x+45)
2)now distribute 2
18x+90=18x+90
these equations are exactly the same! this means that this equation has infinitely many solutions
Hope this helps!