Here are the first four terms of a sequence. 4
11
22
37
Find an expression, in terms of n, for the nth term of this sequence.

Step-by-step explanation:

We observe that the difference of terms is 4, 7 and 15 and next level difference is 4. It means the sequence is quadratic.

We can compare this with simple quadratic sequence

and find out that doubling each term gives us

This is close to our sequence, write the terms as follows to find exact rule

The first term:

The second term

The third term:

The fourth term:

The nth term as per observation above is:

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:

30.5*10=350$

you have to multiply the number without the decimal point then add it later but if its tenn u must move the place value of the decimal point 1 to the right.