twenty-five percent of teachers at elway middle school assigned homework for this weekend. if 7 teachers assigned homework this weekend, how many teachers work at elway middle school

28

Step-by-step explanation:

25 percent of teachers are 7 teacher

100 percent of teachers are X teachers

Do crisscross to get Z

100x7=25X

—> X= (700)/25= 28

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:

168

step-by-step explanation:

first off, we know that he drove 3.5 hours at a rate of 48 mph.

knowing that, we want to see how many miles he drove all-together.

in this case, we can just multiply 48 by 3.5.

48 * 3.5 = 168