Answer:
Step-by-step explanation:
This is an inverse proportion.
men = k / Time So first we need to find k
k = men * Time Substitute values
k = 15*80
k = 1200 Notice the units are man days.
Now what happens if we increase the number of men to 20? What happens to the number of days.
20 = 1200 / time Multiply both sides by time
20*time = 1200 Now divide by 20
time = 1200/20
Answer: time = 60 days
find: choose the correct option
Explanation:(a)
![\begin{gathered} sin(28^0)=cos(90^0-28^0)=cos(62^0) \\ 62^0\text{ is right answer.} \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%20sin%2828%5E0%29%3Dcos%2890%5E0-28%5E0%29%3Dcos%2862%5E0%29%20%5C%5C%2062%5E0%5Ctext%7B%20is%20right%20answer.%7D%20%5Cend%7Bgathered%7D)
(b)
![\begin{gathered} cos(33^0)=sin(90^0-33^0)=sin(57^0) \\ 57^0\text{ is correct answer.} \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%20cos%2833%5E0%29%3Dsin%2890%5E0-33%5E0%29%3Dsin%2857%5E0%29%20%5C%5C%2057%5E0%5Ctext%7B%20is%20correct%20answer.%7D%20%5Cend%7Bgathered%7D)
(c)
![\begin{gathered} cos(31^0)=sin(90^0-31^0)=sin(59^0) \\ 59^0\text{ is correct answer.} \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%20cos%2831%5E0%29%3Dsin%2890%5E0-31%5E0%29%3Dsin%2859%5E0%29%20%5C%5C%2059%5E0%5Ctext%7B%20is%20correct%20answer.%7D%20%5Cend%7Bgathered%7D)
(d)
25% of 584 is 146. If you meant to say "25% off of the dealer's cost", the answer would be $438, since you're finding what 25% of the original price is (146) and subtracting it from the original price. The equation would be 584 - 146 = 438. I hope this helped <3
Answer:
D.21
Step-by-step explanation:
7×1=7
7×2=14
<u>7×3=21</u>
Therefore 21 is a multiple of 7
Answer:
Step-by-step explanation:
Width = w
Length = double the width = 2*w = 2w
Perimeter of rectangular tray = 60 in
2*(length + width) = 60
2*( 2w + w) = 60
2*3w = 60
6w = 60
Divide both sides by 6
w = 60/6
w = 10 in
length =2w = 2*10 = 20
length = 20 in
Width = 10 in