Part
How much time, in minutes, do water tank A and water tank B have to be drained in order for them to have the same amount of water?
Answer: In 20 minutes, tanks A and B will each have 120 gallons remaining in them.
Step-by-step explanation:
The equation, the amount at which they will be equal, represents the given starting amounts minus the gal/min times the unknown time in minutes, m.
220 - 5m = 180 - 3m Subtract 180 from both sides; add 5m to both sides.
220-180 -5m +5m = 180-180 +5m - 3m Combine like terms
40 = 2m Divide both sides by 2
20 = m
Check: Substitute 20 for m in the equation
220 - 5(20) = 180 - 3(20)
220 - 100 = 180 -60
120 = 120 True!
so first split into two
now we can factorise each
now the inside of the bracket is the same so we can reconfigure like this
all i did was put the two outside terms together to make (r-s)
this is your answer
(r-s)(r+2t)
the object is 12 ft, what is the height of the object if the shadow is 18 ft?
Answer:
8 ft
Step-by-step explanation:
Use the direct variation equation, y = kx, where k is a constant.
Change the equation to fit the variables: L = kH
Plug in the given length of the shadow and the height of the object, then solve for k:
L = kH
27 = k(12)
2.25 = k
So, the equation is L = 2.25H
Then, plug in 18 as L, and solve for H:
L = 2.25H
18 = 2.25H
8 = H
So, when the shadow is 18 feet, the height of the object is 8 ft
Using the concept of direct variation, we find that the constant of variation is 2.25. Subsequent substitution in the equation reveals that the object's height when the shadow is 18ft is 8ft.
The question involves the concept of direct variation in mathematics. In direct variation, two quantities increase or decrease together to keep their ratio constant. This concept is given by the equation Y = kX, where Y and X are the quantities and k is a constant.
In our situation, the length of the shadow (L) varies directly with the object's height (H), i.e., L = kt. We are given that L=27ft when H=12ft, we can find the constant k by solving the equation 27ft = k * 12ft. This will get us k = 27ft/12ft = 2.25.
Now, we can determine the object's height if the shadow is 18ft. By substituting the values into the equation, we get 18ft = k * H. Substituting the value of k (2.25) will yield H = 18ft /2.25 = 8ft. Hence, the object's height when the shadow is 18ft is 8ft.
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B. Because 950 ÷ 40 = 24 R10, she has enough yarn for only 24 picture frames.
C. Because 950 ÷ 40 = 23 R30, she has enough yarn for only 23 picture frames.
D. Because 950 ÷ 40 = 23 R30, she has enough yarn for only 24 picture frames.
Answer:
C. Because 950 ÷ 40 = 23 R30, she has enough yarn for only 23 picture frames.
Step-by-step explanation:
950/40 = 23.75 = 23 r 30
Sara has enough for 23 frames.
Answer:
C. Because 950 ÷ 40 = 23 R30, she has enough yarn for only 23 picture frames.
Step-by-step explanation:
950/40 = 23.75 = 23 r 30
950/40 = 23.75 = 23 r 30Sara has enough for 23 frames.