Mean of a set of numbers is
(sum of the values of the numbers in the set)/(how many numbers in the set)=mean
example
1,2,4
mean is
(1+2+4)/3=7/3
ok
mean of 7 numbers is 21
(7numbers)/7=21
"5 of them are 18,23,21,17"
(mentally do 7-5=2)
2 missing
"one of the remaining is 3/4 of other"
the 2 remaining is x and 3/4x
nmow we have
(18+23+21+17+19+x+3/4x)/7=21
add like terms
(98+1 and 3/4x)/7=21
mulitply everybody by 7
98+7/4x=147
minus 98 both sides
7/4x=49
multiply both sides by 4/7 to clear fraction (7/4 times 4/7=28/28=1, so 1x=x)
1x=196/7
x=28
the other number is 3/4 of this
3/4x=3/4*28=21
the 2 unknowns are 28 arnd 21
"Simplifying a complex fraction" means Simplifying a complex fraction means to rewrite the fractions in the numerator and in the denominator with common denominators.
Step-by-step explanation:
A complex fraction is one where either the numerator or the denominator or both contains common a fraction.
There are two methods to simplify a complex fraction-
First Method
- We simplify the numerator until we have one single fraction.
- Then we simplify the denominator until we have one single fraction.
then we divide by multiplying the numerator by the reciprocal of the denominator.
- The end result is simplified
Second Method
- Firstly we find a common denominator of all the fractions in the numerator and all the fractions in the denominator .
- Then we multiply the number in the numerator and denominator of the complex fraction by a common denominator found in step 1.
- The result is simplified
Answer: PEMDAS
Step-by-step explanation: You wanna add 1 to both sides and get 3√x = 1. Then you wanna multiply 3 by 3√x which leaves you with x cause it canceled out. But remember to multiply 3 on both sides so x = 1 sq rt 3. Which is just 1.
x = 1
Hard to tell the answer choices so here’s what I get. See if if either of these are an answer choice.
2x + y - 8 = 0
Or
-2x - y + 8 = 0
JK I 999999999999999999999999999999 GRADEStep-by-step explanation: NUBERS
