Answer: 36 cm
Step-by-step explanation:
Given : The square has a perimeter =160 cm.
Perimeter of square = 4 (side)
Therefore , the side of square = (Perimeter)÷ 4
= 160 ÷ 4 = 40 cm
The new length of side after dilation = (Scale factor) x (Length of original figure)
For scale factor = 0.9
The new length of each side of the dilated square = (0.9)x(40)=36 cm
Hence, the new length of each side of the dilated square= 36 cm
Answer:
80
Step-by-step explanation:
Answer:
The mean of the total number of students is 85.5
Step-by-step explanation:
REcall that given n data points, the mean is given by
.
Let us number the students of the 24 students' class from 1 to 24 and the let us number the students of the other class from 25 to 47.
The question is to find the following
REcall the following
Then, from this equations we can deduce that
Therefore,