When faced with an unknown variable in a maths problem, it is advised to find the subject formula and then use it to solve the equation to find the answer.
<h3>What is an Unknown Variable?</h3>
This refers to the type of variable in a given equation that has to be solved for because its properties or value is not known.
Hence, we can see that when faced with an unknown variable in a given math problem, it is better to find the subject formula, then input the value of this into an equation, to find the value of the variable.
Read more about unknown variables here:
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Answer:
7
/10 0.7
Step-by-step explanation:
To add fractions, find the LCD and then combine.
Answer:
c
Step-by-step explanation:
The seahorse make a lot of babies because the male carries the babies while the female makes more eggs.
<h3>What is
mating?</h3>
Mating is the process in which opposite or hermaphroditic organisms pair for reproduction.
During mating between the male and female seahorse mates, the female seahorse puts her eggs in the male pouch and the male fertilises the egg in his pouch. The eggs develop into baby seahorse in the father pouch.
Find out more on mating at: brainly.com/question/922533
Answer:
1st Circle
Radius = 9
Diameter = 18
Circumference = 2 × 
× r = 2 × 3.14 × 9 = 56.52
2nd Circle
Radius = 14
Diameter = 28
Circumference = 2 × × r = 2 × 3.14 × 14 = 87.92
:D
