At the movie theatre, child admission is $5.20 and adult admission is $8.40 . on sunday, 170 tickets were sold for a total sales of $1172.00 . how many child tickets were sold that day?

80 children's tickets

Step-by-step explanation:

step up system of equations

let a be number of adult tickets

let c be number of child tickets

a+c = 170

5.20c + 8.40a = 1172

substitute c = 170 - a

5.20 (170 - a) + 8.40 a = 1172

884 - 5.20a + 8.40a = 1172

3.20a = 280

a = 90

c = 170 - 90

13

step-by-step explanation:

169-1=168

168-3=165

165-5=160

160-7=153

153-9=144

144-11=133

133-13=120

120-15=105

105-17=88

88-19=69

69-21=48

48-23=25

25-25=0

since it took 13times to completely subtract it hence its square root is 13