Answer:
157
Step-by-step explanation:
We are given that
Number of students in maths 2A=n(2A)=51
Number of students in math 2B=n(2B)=80
Number of students in math 2C=n(2C)=70
Number of students in maths 2A and 2B=
Number of students in maths 2B and 2C=
Number of students in maths 2A and 2C=
Number of students in maths 2A ,2B and 2C=4
We have to find the number of students in a set.
Formula:
Substitute the values in the given formula
Hence, total number of students in a set=157
Answer:
System of equations:
6d + 3p = 42.75
10d + 15p = 98.75
Drink = $5.75
Popcorn = $2.75
Step-by-step explanation:
6d + 3p = 42.75
subtract 6d from both sides
3p = 42.75 - 6d
divide both sides by 3
p = 14.25 - 2d
substitute P in the second equation with the answer and solve for D
10d + 15( 14.25 - 2d) = 98.75
distribute out the 15
10d + 213.75 -30d = 98.75
-20d + 213.75 = 98.75
subtract 213.75 from both sides
-20d = -115
divide both sides by -20
d = 5.75
substitute D back in the first equation and solve for P
3p + 6(5.75) = 42.75
multiply the 6 and 5.75
3p + 34.5 = 42.75
subtract 34.5 from both sides
3p = 8.25
divide both sides by 3
p = 2.75
Answer:
x = -16
Step-by-step explanation:
-1/3 * 9x = -3x
-1/3 * 30 = -10
-10 + 2 = -8
40 = -3x - 8
+8 +8
48 = -3x
--- ----
-3 -3
-16 = x
x = -16
~ Zoe
I believe that the answer is 13
