2- Jack and Jill went out to dinner. Jack ordered a slice of pizza for $4.99 and a drink for $1.89. Jill ordered a salad for $5.49 and a drink for $1.89. They each had a 15% coupon for their meal.
How much did Jill pay for her meal?
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3- A video game costs a retailer $24. The store marks it up 35%, what is the markup amount?
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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: