Answer:
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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 )
If there are 4 ounces of vanilla in a 12 ounces milkshake , it means that every 3 ounces of milkshake , 1 ounce of those 3 ounces is vanilla 4 ÷ 12 = 1/3
1/3 is the proportion of vanilla and milkshake.
4 ÷ 12 can also be written as 2/6 or 4/12
Awnser : 1/3 , 2/6 or 4/12 , 8/24 etc ...
ps. dont drink this milkshake , it is just chocolate and vanilla ( theres not even milk in it )
Answer:
1/2
Step-by-step explanation:
Answer:
x = 0 1 -1 -2
y = -3 -4 -2 -1
Step-by-step explanation:
equation : 3y+9x = -9
when x = 1
3y+3x = -9
or, 3y + 3×1= -9
or, 3y+3=-9
or, 3y = -12
so, y = -4
Again
Let's suppose x as -1
3y+3x= -9
or, 3y+ 3×-1 = -9
or, 3y-3 = -9
or, 3y = -6
y = -2
Let's suppose x as -2 now,
3y+3x = -9
3y+3×-2 = -9
or, 3y-6 = -9
or, 3y = -3
so, y = -1
