The amount of certain substances in drinking water is limited by environmental agencies and often measured in parts per million. Suppose the limit on the concentration of lead in local drinking water is expressed in scientific notation as 1.5 X 10 -2. How could 1.5 X 10-2 be written as a decimal number?
2006-10-05 15:43:32 · 5 answers · asked by uiyuh u 1 in Education & Reference ➔ Homework Help
1.5 x 10^-2 = .015
Note that you move the decimal point two places to the left - 10^-2.
10^-2 = 1/10^2 = 1/100, so the problem is asking you for 1.5 one-hundredths. One hundredth is .01, and the rest follows from there.
2006-10-05 15:49:21 · answer #1 · answered by Anonymous · 1⤊ 0⤋
1.5 X 10^-2, ^ means power.
Ok,
1.5 X 10^-2 = 0.15 X 10^-1 = 0.015 X 10^0 = 0.015
It's really simple.
2006-10-05 22:52:06 · answer #2 · answered by husam 4 · 0⤊ 0⤋
.015 when the exponent behind the ten is negative move the decimal left that many times. when it's positive move the decimal right that many times. in this case you moved it left two spaces.
2006-10-05 22:49:24 · answer #3 · answered by Dee 4 · 0⤊ 0⤋
we are currently doing the same thing in my class!
anyway
1.5
since the exponent is -2, you move the decimal point 2 spaces backwards and put zeros in the blank spaces.
1.5
.15 x10-1
.015 x10-2
your answer is .015.
i hope this helps and gets chosen as the best answer!
2006-10-05 22:48:56 · answer #4 · answered by Anonymous · 2⤊ 0⤋
0.0015 Dalton is right; i am old and sometimes in too big of a hurry.
2006-10-05 22:46:46 · answer #5 · answered by Anonymous · 0⤊ 1⤋