Answer:
x = 2.4
Step-by-step explanation:
Corresponding sides of the similar triangles are proportional:
x/(x+3) = 8/18
18x = 8(x +3) . . . . . multiply by 18(x+3)
10x = 24 . . . . . . . . subtract 8x
x = 2.4 . . . . . . . . . . divide by 10
Answer:
1. 16x-188
2. 5x-90
Step-by-step explanation:
1.
9x-8+7x-y=180
y=9x-8+7x-180=16x-188
2.
2x-y+3x=90
y=5x-90
In an inverse proportion two veriables are inversely proportional to each other.You can write the equation as P=n/x, and N is the constant of proportionality.In the equation the X increases and the P decreases.
Answer:
16
Step-by-step explanation:
The mean of a group of values is calculated as
mean = 
Given 5 numbers with a mean of 12, then
= 12 ( multiply both sides by 5 )
sum = 60
let the number removed be x , then
= 11 ( multiply both sides by 4 )
60 - x = 44 ( subtract 60 from both sides )
- x = - 16 ( multiply both sides by - 1 )
x = 16
The number removed was 16
Set up a proportion.
Let x = the number of students in 29970 who speak 3 or more languages.
285/19 = 29970/x Cross multiply
285 x = 19 * 29970
285x = 569430
x = 569430/285
x = 5415 students speak 3 languages.
