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polet [3.4K]
3 years ago
11

Y varies directly as x. If x = 15 when y = 20, find x when y = 30.

Mathematics
1 answer:
Goryan [66]3 years ago
5 0

Answer:

22.5

Step-by-step explanation:

y=kx

20=k15

k=1•33

30=1•33x

x=22•5

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Số táo của An, Bình, Chi là như nhau. An cho đi 17 quả , Chi cho đi 19 quả thì lúc này số táo của Chi gấp 5 lần tổng số táo còn
soldier1979 [14.2K]

Answer:

So, the initial number of apples is 7.

Step-by-step explanation:

The number of apples of An, Binh, and Chi are the same. An gave away 17 apples, Chi gave away 19 apples, so now Chi's apples are 5 times higher than the total remaining apples of An and Binh. How many apples did each of you have at first? (Solve the above problem by equation or system of equations)

Let the initial numbers of apples is a.

An gave 17 apples

Chi gave 19 apples

So,

x - 19 = 5 (x - 17 + x)

x - 19 = 5 (2x - 17)

x - 19 = 10 x - 85

9 x = 66

x = 7

6 0
3 years ago
Question is in picture<br><br> Drag and drop the steps in order to correctly complete the proof
gavmur [86]

9514 1404 393

Explanation:

The correct order of the steps is ...

  • (Given)
  • (Definition of supplementary)
  • (Substitution)
  • (Subtraction ...)
  • (Definition of congruent angles)

A proof always starts with "given". It always ends with a statement of what you have proved.

To fill in the sequence between these, it helps to think about what the relationships are and why you can conclude that the theorem is correct.

5 0
2 years ago
Question number eight answer
Feliz [49]

I think you forgot to attach the picture w/ the question . .

7 0
2 years ago
In the dryer there are 18 red socks, 24 white socks, 8 blue socks, and 10 black socks. Fred wants to have two matching socks to
liraira [26]
I'm guessing that the answer would be 60
8 0
3 years ago
The tens digit is twice the units digit. Reverse the digits, add 2 and the new number is 34 less than the original number. Find
inna [77]

Answer:

Step-by-step explanation: X and Y represent the digits.

The tens digit is twice the units digit.

The digit in the Tens place has 10× its base value, so we can set up equations to model the information given.

10x +y 10y +x are Original & Reversed numbers

X = 2y means the Tens digits is twice the units digit.

10y + x +2 = 10x +y - 34 models the statement: The reversed number plus two is 34 less than the original number.

Substitute 2y for x to solve for y

10y +2y +2= 10(2y) + y -34

Distribute and combine like terms

12y + 2 = 20y +y - 34

34 +2 = 21y -12y

36 = 9y Divide both sides to find the value of y.

4 = y

X = 2(4) Substitute 4 for y to find x

X = 8

Original number: 84 Reversed number: 48

Substitute into equation model

48 +2= 84 -34

50 = 50

True!

3 0
3 years ago
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