Answer:
23pupils
Step-by-step explanation:
Given parameters:
Number of 18th grade boys this year = 18
Percentage decrease = 28%
Unknown:
How many 8th grade teams were there last year = ?
Solution:
Since this is a percentage decrease, ;
Number of pupils this year = Number of pupils last year - (28% x 18 )
18 + (28% x 18 ) = Number of pupils last year
Number of pupils last year = 23pupils
Answer:
About 5 hr 10 min
Step-by-step explanation:
rate 1 = 1 pool / 9 hrs rate 2 = 1 pool / 12 hours
now find the time with both rates combined
1 pool / ( 1/9 + 1/12) = 1/ (7/36) = 36/7 hr = 5 1/7 hr = 5 hr 8.6 min
Answer:
f(x) = (x+6)² - 10
Step-by-step explanation:
To write the equation in vertex form we, we need to use completing square method.
f(x) = x²+ 12x + 26 = (x² + 2*x*6 + 6²) - 6² + 26 = (x+6)² -36 + 26 =
= (x+6)² - 10
f(x) = (x+6)² - 10
