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serious [3.7K]
3 years ago
13

How many times smaller is 4 × 10-9 than 8 × 10-7? A. 200 B. 20 C. 20,000 D. 2,000

Mathematics
1 answer:
masya89 [10]3 years ago
4 0

Answer:

17

Step-by-step explanation:

4×10-9= 4

8×10-7=21

21-4=17

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The temperature of earth may be measured either by thermometers on the ground, which is an accurate but tedious method, or by se
qwelly [4]

Answer:

Analysis of variance (ANOVA) is the most accurate to estimate the difference

Step-by-step explanation:

Analysis of variance (ANOVA) is the best statistical method that can be used to determine the systematic difference between the mean values of two given set of population in any random experiment

In this case the two set of populations would be the one in which temperature is measured by thermometers on ground and sensor mounted in a space satellite.  

8 0
3 years ago
During the first decade of the century, the population of a certain city was 145,380 in 2000 and 219,135 in 2010. Find the expon
Likurg_2 [28]

Answer:

The exponential growth function is P=145380e^{0.04103t}

Step-by-step explanation:

Given: The population of a certain city was 145,380 in 2000 and 219,135 in 2010.

To find: exponential growth function that models the growth of the city

Solution:

The exponential growth function is given by P=P_0 e^{kt}

Here, P denotes total population after time t

P_0 denotes initial population

k denotes rate of growth

t denotes time

As P(0)=145,380,

145380=P_0e^{0}\\145380=P_0\\P=145380e^{kt}

As P(10)=219135

219135=145380e^{10k}\\e^{10k}=\frac{219135}{145380}\\=1.507326\\k=\frac{1}{10}\ln (1.507326)\\=0.04103\\\Rightarrow P=145380e^{0.04103t}

8 0
3 years ago
8-2y=3y-2<br> Help me please
lesya692 [45]
This seems like a lot more work than it is, but here we go
Simplifying<span>8 + -2y = 3y + -2 
 Reorder the terms: 8 + -2y = -2 + 3y 
 Solving 8 + -2y = -2 + 3y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right.
  Add '-3y' to each side of the equation. 8 + -2y + -3y = -2 + 3y + -3y Combine like terms: -2y + -3y = -5y 8 + -5y = -2 + 3y + -3y 
 Combine like terms: 3y + -3y = 0 8 + -5y = -2 + 0 8 + -5y = -2 Add '-8' to each side of the equation. 8 + -8 + -5y = -2 + -8 
 Combine like terms: 8 + -8 = 0 0 + -5y = -2 + -8 -5y = -2 + -8 Combine like terms: -2 + -8 = -10 -5y = -10
  Divide each side by '-5'. y = 2 
 Simplifying y = 2</span><span>

</span>
4 0
3 years ago
Read 2 more answers
The radius of a cone is 10 units and the<br> height is 5 units. What is the volume?
kumpel [21]

Answer:

523.6

Step-by-step explanation:

V=πr^2(h/3)=π*10^2*(5/3)=523.59878

3 0
3 years ago
The area of a triangle is 323 square centimeters. The length of the base is 38 centimeters. What is the height of the triangle?
Free_Kalibri [48]
It is B. This is because the formula for area of a triangle is A=1/2bh 323 = 1/2 (38) h 323= 19h 323/19 = 17
6 0
3 years ago
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