HELP The distance around a neighborhood block is 4 miles. When using her car to measure the distance, Heather found the distance to actually be 3.8 miles. What is the percent of error?

a. she will receive a refund of $278.

step-by-step explanation:

m∠a is 90°

m∠b is 40°

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:

hard

step-by-step explanation: