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sweet-ann [11.9K]
3 years ago
15

Can someone please help with this as soon as possible? Thanks

Mathematics
1 answer:
deff fn [24]3 years ago
8 0

Answer:

60

Step-by-step explanation:

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If y varies directly as x and z, and Y=40 when x =5 andz = 4, find y when x=2 and z = 1
Yuki888 [10]

Answer: When x=2 and z = 1, then the value of y =4.

Step-by-step explanation:

Given: y varies directly as x and z i.e. y\ \alpha \ xz

y=k(xz)      (i) , where k is the proportionality constant.

Put  Y=40 ,x =5 and z = 4, then we get

40=k(5\times4)\\\\\Rightarrow\ k=\dfrac{40}{20}\\\\\Rightarrow\ k=2

Required equation: y=2(xz)  [Put value of k in (i)]

Now put x=2 and z = 1, then we get

y=2(2\times1)=2(2)=4\\\\\Rightarrow\ y=4

Hence, when x=2 and z = 1, then the value of y =4.

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4 years ago
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<h2>Answer:</h2>

The Mean is simply the average of all the numbers. Meaning(see what I did there):
The answer is D) 49.3

<h2>Step-by-step explanation:</h2>

To find the Mean all you have to do is find the average for all the numbers. That's what a Mean is. So put simply all you have to do is add all the numbers and divide by how many there are.
43+55+51+62+64+38+35+45+51 =
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Estimate_________rulers,or________feet a door with twelve inches ruler
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3 years ago
A coin bank contains only quarters and dimes. The total value of the coins in the bank is $8.80. If the dimes were quarters and
masha68 [24]

Answer:

  • 18 dimes

Step-by-step explanation:

Let the number of dimes be d and quarters be q

<u>The value is $8.80 = 880¢, so:</u>

  • 10d + 25q = 880 ⇒ 2d + 5q = 176

<u>If the dimes were quarters and the quarters were dimes, the coins' total value would be $7.30 or 730¢</u>

  • 25d + 10q = 730 ⇒ 5d + 2q = 146

<u>Now we have 2 equations. Solving the system by elimination, subtract 5 times the second equation from twice the first equation:</u>

  • 2(2d + 5q) - 5(5d + 2q) = 2(176) - 5(146)
  • 4d - 25d = -378
  • -21d = -378
  • d = -378/-21
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3 years ago
Someone please help me with number ten!!
ivann1987 [24]

Answer:

C

Step-by-step explanation:

starts with 4 and is multiplied by 3 every term

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