In one hour at pete’s pet store, 25 customers bought items. 12 customers bought items for dogs, and 5 of those customers also bought items for cats. if 4 customers bought items for neither dogs nor cats, how many people bought items for cats only? (hint: on a piece of paper, draw a venn diagram to represent the situation) a. 5 b. 7 c. 9 d. 14

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: