The dot plots below show the test scores of seventh- and eighth-grade students: Based on visual inspection of the dot plots, which grade, if any, appears to have the higher mean score? Grade 7 Grade 8 Both groups show about the same mean score. No conclusion about mean score can be made from the data. Grade 7 : 6 dots for 50,4 dots for 60, 6 dots for 70,4 dots for 80. Grade 8 : 7 dots for 60 ,4 dots 70,4 dots for 80,3 dots for 90 ,and 2 dots for 100.

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

24

step-by-step explanation:

if it takes 8 pounds to make 12 divide 12 by 8 and you get 1.5, 1.5 x 16 = 24

the answer is 13 cm

3100

step-by-step explanation: