Can someone help me please

w = 2.1

Step-by-step explanation:

5w + 9.2 = 19.7

5w + 9.2 - 9.2 = 19.7 - 9.2

5w = 10.5

5w / 5 = 10.5 / 5

w = 2.1

Here is the check:

5w + 9.2 = 19.7

5(2.1) + 9.2 = 19.7

10.5 + 9.2 = 19.7

19.7 = 19.7

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,

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: