Answer:
mean ≈ 25.45
Step-by-step explanation:
mean is calculated as
mean = 
We require the sum for both classes
class A
mean = 
= 40 ( multiply both sides by 9 )
sum = 9 × 40 = 360
class B
mean = 
= 20 ( multiply both sides by 24
sum = 24 × 20 = 480
Total sum for both classes = 360 + 480 = 840 , then mean for both classes is
mean = 
≈ 25.45 ( to 2 dec. places )
The constant of proportionality,m, is 3 (option B)
Answer:
x= 1/2 , 3/4
(2x-1)(4x-3)=0
Step-by-step explanation:
set the equation equal to zero and factor the left side.
Answer:
339, 340, 341
Step-by-step explanation:
To find the 3 consecutive numbers, divide the sum by 3 to get the average. 1020/3=340. So the middle number is 340. That means the numbers are 339, 340, and 341.
The first box is correct.
The fourth box is correct.
So, you would check those both. Hope this helps!
