Alejandro bought $3.50 worth of pencils and erasers at the school store. pencils cost $0.50 apiece, and erasers cost $0.75 apiece. which equation written in standard form represents the number of pencils, p, and the number of erasers, e, that alejandro bought?

a. 0.75e = 3.50 – 0.50p
b. 0.50p + 0.75e = 3.50
c. 3e = 14 – 2p
d. 2p + 3e = 14

The answer is the option B

Step-by-step explanation:

Let

p------> the number of pencils

e------> the number of erasers

we know that

The total cost of pencils and erasers, is equal to the numbers of pencils multiplied by plus the number of erasers  multiplied by

so

------> equation that represent the situation written in standard form

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:

answer: idk wbu

step-by-step explanation: umm..