Amar and sang mowed lawns to earn money to go on a trip at the end of the month. they both mowed the same number of lawns. amar earned $20 for each lawn he mowed in his neighborhood. sang earned $15 for each lawn he mowed in his neighborhood. ⦁ using a variable, write an expression that describes the total amount of money earned by both boys at the end of the month. define what the variable represents. ⦁ amar and sang mowed 10 lawns each by the end of the month. they need $400 for a summer trip. do they have enough money for their trip? show or explain your work.

Part 1 :Using a variable, write an expression that describes the total amount of money earned by both boys at the end of the month.

Let the number of lawns mowed be = x

Earnings of Amar = 20x

Earnings of Sang = 15x

So total earnings are =

Part 2: Amar and Sang mowed 10 lawns each by the end of the month. They need $400 for a summer trip. Do they have enough money for their trip?

Total number of lawns mowed by each are = 10

Amar earned =

Sang earned =

So, total money earned = = $350

No, they don't have enough money for their trip. They are short of $50.

40 is the final : )

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is: