Roberta wanted to find out if studying more hours every week helped her math grade. The chart below shows how many hours Roberta studied each week and the grade she made on her weekly math test. Test Grades
Number of Hours Studying 3 4 5 6 7 8
Grade on Test 86 88 90 92 94 ?

If Roberta studies for 8 hours, what grade can she expect to get on her next math test?

25

step-by-step explanation:

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.

answer: about 22.67

step-by-step explanation: