Answer:
Yes there is a constant rate of change of 1/3.
Step-by-step explanation:
The slope stays the same the whole time therefore the ratio does not change, so it is proportional.
<span>3x – 4y = 65
</span><span>3x – 4(4) = 65
3x - 16 = 65
3x = 81
x = 27</span>
Answer:
76
Step-by-step explanation:
Answer:
39 degrees
Step-by-step explanation:
A triangle sums up at 180 degrees.
Therefore, 102+39=141.
Subtract 180 by 141 and you get 39!
To know if your answer is correct, add all angles and
make sure to get 180 in total!
Answer:
mean score of class B = 1778/25 = 71.12
Step-by-step explanation:
This was your question : Class A has 12 pupils and class B has 25 pupils. Both classes sit the same maths test. The mean score for class A is 80. The mean score for both classes is 74. What is the mean score (rounded to 2 DP) in the maths test for class B?
mean of class A = Σfx/Σf
mean of class A = 80
Σfx = 80 × 12 = 960
Mean score for both classes = 74
where
b = Σfx of class B
960 + b/37 = 74
cross multiply
960 + b = 2738
b = 2738 - 960
b = 1778
mean score of class B = Σfx/Σf
Σfx = 1778
Σf = 25
Therefore,
1778/25 = 71.12
