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VashaNatasha [74]
3 years ago
11

Solve the equation -18 = 1/4y

Mathematics
2 answers:
RSB [31]3 years ago
6 0

Answer:

-72

Step-by-step explanation:

-18 = 1/4y

1/4y = -18

y = -18 times 4

y = -72

Serjik [45]3 years ago
6 0

Answer:

y = -72

Set each factor to 0

Simplify both sides of the equation, and then, isolate the variable, which is y.

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tatyana61 [14]
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5 0
3 years ago
When you reverse the digits in a certain 2 digit number you decrease its value by 81. What is the number if the sum of its digit
arlik [135]

Answer: 90 is a number which has 9 as the sum of its digits, 9+0=9 and if the digits are reversed, 09 is 81 less than 90.

Step-by-step explanation: Since the number must be a 2-digit number, it seems that 90 is the only number that qualifies.

If you need some equations, here is a way to set up a system to solve:

x+y= 9 rewrite to get a value for y to substitute:

y = 9-x

10x +y = 10y + x + 81 rewrite by moving (subtracting variable terms from both sides)

10x -x + y-10y = 81 combine like terms

9x - 9y = 81

Substitute for y and solve for x

9x - 9(9-x)= 81 distribute.

9x - 81 + 9x = 81

18x = 162. 162/18 = 9

x = 9

Substitute in the original equation to solve for y

9 + y = 9

y = 0

10(9) + 0 = 10(0) + 9 +81

90 - 81 = 09

6 0
3 years ago
Sketch the graph, showing one complete cycle. State the period and amplitude, and the greatest and least values of yy=3sin(θ−π/2
Alborosie
Explanation:

Consider the following general periodic function:

y=a\sin b(\theta\text{ -h})\text{ +k}

where

a= amplitude

b = frecuency

h= phase translation

k= vertical translation

2π/ |b| = period

Now, consider the following periodic function:

y=3sin(\theta\text{ -}\frac{\pi}{2})

Applying the definition given at the beginning of this explanation, we can see that:

a = amplitude = 3

2π/ |b| = period = 2π/|1| = 2π

Then, the graph of the given function is:

Notice that the greatest and least values of y are 3 and -3 respectively.

We can conclude that the correct answer is:

Answer:

Graph:

Period:

2π

Amplitude:

3

The greatest value of y (coordinate y of the maximum point):

3

The least value of y (coordinate y of the minimum point):

\text{ -3}

3 0
1 year ago
What is the mean of 10, 39, 71,39,76,38,25
Ghella [55]

Answer:

42.57

Step-by-step explanation:

Add all of the numbers together:

10+ 39+ 71+ 39+ 76+ 38+ 25=298

Divide by the total numbers that are there:

298÷7=42.57

Hope this helps ^-^

8 0
3 years ago
Find the first term and common ratio for the geometric sequence a2 =2.5,a4=62.5
fenix001 [56]

Answer:

a1 = 0.5; common ratio = 5

Step-by-step explanation:

Let the common ratio = r

a2 = 2.5

a3 = 2.5r

a4 = 2.5r * r = 2.5r^2

We are told a4 = 62.5, so

2.5r^2 = 62.5

Divide both sides by 2.5

r^2 = 25

r = 5

a2 = a1 * r

a1 = a2/r = 2.5/5 = 0.5

Answer: a1 = 0.5; common ratio = 5

6 0
3 years ago
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