The ratio of the number of Grade 6 students to the number of Grade 7 students to the number of Grade 8 students in a school is 3 : 3.4 : 3.2 . If the school has 480 students in these grades, how many are in Grade 8?

  160

Step-by-step explanation:

The fraction of students in grade 8 is ...

  (grade 8 students)/(total students in all grades)

  = 3.2/(3 +3.4 +3.2) = 3.2/9.6 = 1/3

Then the number of students in grade 8 is ...

  (1/3)(480 students) = 160 students . . . in grade 8

c. 27 units.

step-by-step explanation:

we are told that in circle a, ∠bae ≅ ∠dae.

we can see from our given diagram that in and ;

, as these are radii of our given circle.

therefore, by sas congruence postulate.

hence, side be will be equal to side de as corresponding parts of congruent triangles are congruent. so we can set an equation to find the value of x as:

now let us substitute x=17 in the expression for the length of be.

therefore, length of be will be 27 units and option c is the correct choice.

answer: 800

step-by-step explanation: