Gearyjames8
28.08.2019 •
Mathematics
The table shows numbers with the ratio x : y. find the missing number.
x 4 ? 36 42
y 20 120 180 210
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Ответ:
x: 4,_,36,42
y:20,120,180,210
Getting the ratios of each corresponding values we get:
4:20=1:5
36:180=1:5
42:210=1:5
therefore the common ratio is 5. Hence the missing value will be:
120/5=24
The missing number is therefore 24
Ответ:
A
Step-by-step explanation:
We want to simplify the expression:
Notice that this is the difference of two squares. That is:
We can let a = 4 and b = 2i. Hence:
Simplify:
In conclusion, our answer is A.