In standard form:
5. 3.2 x 10^3
7. 4.1 x 10^8
9. Write the average weight of a blue whale, 2.6 x 10^5, in standard form.
15. 2.5 x 10^-3
17. 1.05 x 10^-2
19. Write the size of a grain of very fine sand, about 9.35 x 10^-3 cm, in standard form.
Can somebody help? I have been stuck on these questions for 30 minutes....
Thanks.
I don't understand what you mean by "I have been stuck on these questions for 30 minutes.... "
Are you just staring at the questions?
The concept of scientific notation can be learned in less than 5 minutes.
5. 3.2 x 10^3
= 5.3 x 1000
= 5300
15 . 2.5 x 10^-3
= 2.5 x .001
= 0.0025
You try the others.
what operation is being performed 1.2x10^2+2.5x10^4=
5.7 * 10^6
Sure, I can help you with these questions. To convert numbers written in scientific notation (with the exponent) into standard form, you need to understand the basic concept. The exponent tells you how many places you need to move the decimal point.
Let's go through each question one by one:
5. 3.2 x 10^3
To convert this to standard form, you need to move the decimal point 3 places to the right since the exponent is positive. So, the answer is 3,200.
7. 4.1 x 10^8
Again, the exponent is positive, so you need to move the decimal point 8 places to the right. The answer is 410,000,000.
9. 2.6 x 10^5
Move the decimal point 5 places to the right. The answer is 260,000.
15. 2.5 x 10^-3
This time, the exponent is negative, so you need to move the decimal point 3 places to the left. The answer is 0.0025.
17. 1.05 x 10^-2
Moving the decimal point 2 places to the left gives you the answer of 0.0105.
19. 9.35 x 10^-3 cm
To convert to standard form, move the decimal point 3 places to the left. The answer is 0.00935 cm.
Remember, the key concept is that the exponent tells you how many places to move the decimal point, and positive exponent means move to the right, while negative exponent means move to the left.