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2 years ago

Write a subtraction fact with the same difference as 16-7

Mathematics

2 answers:

sergiy2304 [10]2 years ago

6 0

Answer:

The expressions 13 - 4, and 15 - 6 produce the same result as 16 - 7.

Step-by-step explanation:

Given that

16 - 7

Simplifying

16 -7 = 9

Now we have to written a subtraction expression which yields the same result as 16-7.

We can have many such expressions; however, for the time being few can be taken as an example.

13 - 4 =9

15 - 6 = 9

Anon25 [30]2 years ago

3 0

18-9=9 and so does 10-1

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2 years ago

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2 years ago

Find the length of the tangent segment AB to the circles centered at O and O' whose radii are a and b respectively when the circ

bixtya [17]

Answer:

$AB=2\sqrt{ab}$

Step-by-step explanation:

From figure,

$OA=a, \quad \quad O'B=b\\\Rightarrow OO'= (a+b) \quad \quad \text{and}\quad OD=(a-b)$

In triangle $OO'D$

$(OO')^2=(OD)^2+(O' D)^2$

$\Rightarrow (a+b)^2=(a-b)^2+(O' D)^2\\\Rightarrow a^2+b^2+2ab-a^2-b^2+2ab=(O' D)^2\\\Rightarrow 4ab=(O' D)^2\\\Rightarrow O'D=2\sqrt{ab} \\\Rightarrow O' D=2\sqrt{ab}=AB \quad \quad [\because O' DAB\;\; \text{is a rectangle.}]$

Hence, $AB=2\sqrt{ab}$

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3 years ago