How many ways can mrs. sullivan choose two students from 27 to put away calculators at the end of class

351 ways

Step-by-step explanation:

∵ She wants to choose 2 students from a group of 27 students

∴ The first choice contains 27 choices

∴ The second choice contains 26 choices

∴ She has = 27 × 26 = 702 ways but each group repeated twice

Ex: The group of (Nada , Aly) the same with (Aly , Nada) to avoid that we will divide the answer by 2

∴ She has = 702 ÷ 2 = 351 ways

This operation called Combination

c. 65°

step-by-step explanation:

we are given a triangle with two known angles, 62° and 53°, while the third angle x is unknown and we are to find its value.

we know that the sum of angles in a triangle is equal to a total of 180 degrees. so we can write it as:

x + 62° + 53° = 180°

solving to find the value of x:

x = 180 - (62 + 53) = 65°

therefore, the value of x in this triangle is 65°.

i believe it is c.y = 9x

rise over run. 9 units up over 1 unit right or 9/1