A middle school principal orders 60 pizzas for a school-wide pizza party. Each pizza is either cheese, pepperoni, or mushroom. There are an equal number of cheese and pepperoni pizzas. Of the total amount of pizzas, 40% are mushroom. How many pepperoni pizzas are there?

a = 3.14

b = 18

c = 18/5 or 3.6 or 3 3/5

step-by-step explanation:

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: