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love history [14]
3 years ago
5

About how many times larger than the diameter of a red blood cell is the diameter of a grain of sand? Write your answer using a

power of ten. The red blood cell is 8.4 times 10 to the power of negative 6. The grain of sand is 2.4 times 10 to the power of negative 3. I'm not quite sure how to work this problem out from here.
Mathematics
1 answer:
Alchen [17]3 years ago
6 0

Answer:

0.29\cdot10^3

Step-by-step explanation:

Red blood cell: 8.4\cdot 10^{-6}

Grain of sand: 2.4\cdot 10^{-3}

The "how many times larger" part can be figured out by forming a ratio between the two diameters above:

\frac{2.4\cdot 10^{-3}}{8.4\cdot 10^{-6}} = \frac{2.4}{8.4}\cdot\frac{10^{-3}}{10^{-6}}\approx 0.29\cdot 10^{-3-(-6)}=0.29\cdot10^3

Note that dividing the powers of ten corresponds to subtracting the denominator power from the numerator power of 10.

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2 years ago
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8 0
3 years ago
What is the value of the expression <br> 3<br> 6 - (- 11.5)?<br> 4
Digiron [165]

Answer: 31 hope this helped

Step-by-step explanation: I'm assuming your problem looks like this: 4+5*6-3 =? To solve this problem you need to use the order of operations. PEMDAS which stands for Parentheses, exponents, multiply and divide, and lastly add and subtract. You must multiply and divide before you add and subtract so you must do 5*6 first. You now get 4+30-3. Now all you have left is addition and subtraction so you now just go from right to left and do one at a time. So 4+30 = 34 , 34-3=31. Therefore your answer should be 31. Hope that helped!

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2 years ago
Help please important
Lemur [1.5K]
1) tan 41°= 30cm divide by y cm
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