Walkway over the hudson, a bridge that crosses the hudson river in poughkeepsie, is 2.063 kilometers long. anping bridge, which was built in china 850 years ago, is 2.07 kilometers long.
a. what is the total span of both bridges? show your thinking.
b. leah likes to walk her dog on the walkway over the hudson. if she walks across and back, how far will she and her dog walk?

a. The total span of both bridges is 4.133 km.

When calculating the total of two different numbers, addition is the correct math operation to be used. We know that we need to add the length of the bridges together because the word span is the same as length. Also, the question asks about both bridges and uses the word total. 2.063 + 2.07 = 4.133 km.

b. Leah and her dog will walk 4.126 km.

The question says that Leah walks across and back. This means she goes over the bridge two times. Times indicates that we should use multiplication for our math operation. Since she does the length two times, we need to multiply the length of the Walkway Over the Hudson bridge times 2. The math equation is 2.063 x 2 = 4.126 km.

Addition

Addition is the math operation used to determine the total of a set of different numbers. Total means how many altogether.

Multiplication

Multiplication is the math operation used when finding the total when a number occurs multiple times.

Division

Division is used when breaking a number into an equal number of groups.

Subtraction

Subtraction is used when trying to find the difference between numbers

Subject: Math

Level: Middle School

Topic: Word Problems

multiplication, division, addition, subtraction

What is multiplication?: link

What are the properties of addition?: link

First, We have to find total span of both bridges

As Question indicates 'total' ,that is, we have to find bridge length in total ( You can join Bridges to have better understanding)

Now, Walkway over hundson Bridge length= 2.063 km

Amping bridge length= 2.07 km

So, Total span of both bridges = 2.063+2.07 = 4.133 km

b) Now Leah wanna walk across and back on walkway over hudson ,that is, she wanna return to starting point from where she walk forth

So,that means, she walk double distance of length of walkway over hudson

So, total distance = 2× 2.063

= 4.126 km

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9