Answer:
it is C. 25
Step-by-step explanation:
hoi .w.
Answer:
15,219.90
Step-by-step explanation:
.88 rounded to the nearest tenth would be 90. 8 is closer to 10 than 0 therfore you round up to .90
Answer:
View the explanation
Step-by-step explanation:
The sine of an angle is equal to the cosine of that angle minus 90 degrees, and vice versa. Since 65=90-25, the cosine of 25 is equal to the sin of 65. If this is unclear please PM me or comment, and I can help more!
Answer:
a).
grains
b).
c).
years
Step-by-step explanation:
a). Given Sahara desert has an area of approximately = 9400000 km²
= 9400000×(10000000000) cm²
=
cm²
Depth of the desert = 150 m
= 15000 cm
Volume of desert = Area × Depth
= ![9.4\times 10^{16}\times 15000](https://tex.z-dn.net/?f=9.4%5Ctimes%2010%5E%7B16%7D%5Ctimes%2015000)
=
cm³
Since 1 cm³ holds sand grains = 8000
Therefore, Grains in Sahara Desert = ![1.41\times 10^{21}\times 8000](https://tex.z-dn.net/?f=1.41%5Ctimes%2010%5E%7B21%7D%5Ctimes%208000)
= ![1.128\times 10^{25}](https://tex.z-dn.net/?f=1.128%5Ctimes%2010%5E%7B25%7D)
b). Since 1 cm³ = 8000 grains
1 grain =
cm³
c). A truck can carry sand = 20.5 m³ Or ![20.5\times (10^{2})^{3} cm^{3}](https://tex.z-dn.net/?f=20.5%5Ctimes%20%2810%5E%7B2%7D%29%5E%7B3%7D%20cm%5E%7B3%7D)
=
cm³
Now time taken to recreate Sahara Desert =
seconds
= ![\frac{1.41\times 10^{21}}{2.05\times 10^{7}}\times 30](https://tex.z-dn.net/?f=%5Cfrac%7B1.41%5Ctimes%2010%5E%7B21%7D%7D%7B2.05%5Ctimes%2010%5E%7B7%7D%7D%5Ctimes%2030)
=
seconds
=
years
=
years