Please help, x = ? thank you!
2 answers:
Answer: 9.8
Step-by-step explanation:
This is a question that requires you to use ratios and proportions. The quadrilaterals that you have shown in the picture are similar, meaning that they share similar ratios and proportions. Thus, we can assume this:
- 5:7
- 3:4.2
- 2:2.8
- 7:x
To solve for x, we can just take any other ratio and equal it to the 7:x ratio. I'll take 5:7 for example.
, which can also be rewritten as
Let's solve for x by cross-multiplying numbers that when a straight line is made, they are real numbers, and then divide.
Here, it should be:
The answer should be 9.8.
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Answer:
Marco's age is 7 years old
Step-by-step explanation:
Let
x ----> Marco's age
y ----> Paolo's age
we know that
---->
----> equation A
----> equation B
substitute equation A in equation B
Solve the quadratic equation
The formula to solve a quadratic equation of the form
is equal to
in this problem we have
so
substitute in the formula
Remember that the solution cannot be a negative number
so
The solution is x=7
therefore
Marco's age is 7 years old