Find the sum of 12.56 and 45.89

Answers

Answer 1

Answer: 12.56 + 45.89
= (12+45) + (0.56+0.89)
= (57) + (1.45)
= 58.45

Answer 2

Answer: Sum means to add.
12.56 + 45.89 = 58.45 is the answer

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Write an equation in slope-intercept form for a line with slope -3and y intercept -1

Answers

slope-intercept form is y=mx+b where m=slope and b=y-intercept
therefore, y=-3x-1

A 120 watt light bulb uses about 0.1 kilowatt of electricity per hour.if electricity costs $0.20 per kilowatt hour how much does it cost to have a bulb on for an hour?

Answers

A 120 watt light bulb uses about 0.1 kilowatt of electricity per hour.if electricity costs $0.20 per kilowatt hour. Let's solve how much does it cost to have a bulb on for an hour. => 120 watt = 0.1 kilowatt per hour which costs 0.20 per kilowatt per => 0.1 kilowatt per hour * 0.20 = 0.02 dollars in an hour.

Answer:

$0.02 is the cost to have the bulb on for an hour

Step-by-step explanation:

A 120 watt light bulb uses about 0.1 kilowatt of electricity per hour

We can assume 1 kilowatt per hour = 1 unit

So total units of electricity consumed in 1 hour = 0.1 × 1

= 0.1 kilowatt hour or 0.1 unit

Since cost of one unit or 1 kilowatt hour is = $0.20 per unit or kilowatt hour.

Therefore, total cost to have this bulb on for an hour = Number of units consumed by the light bulb × per unit cost

= 0.1×0.20

= $0.02

$0.02 is the cost to have the bulb on for an hour.

Write a real-world problem involving the multiplication of two mixed numbers whose product is about 14. Then solve the problem

Answers

Chelsie has 2 1/2 countainers to put her special designer fabric that is 6 1/2 inches long. Chelsie currently has 2 copies. how many inches long is both fabrics?

Jannie said that 1 2/3 times 9 1/4 is 15.416. Mack said that 1 2/3 times 9 1/4 is 18.75. Is Jannie or Mack right. Show your work. Jannie is right because when you do 1 2/3 times 9 1/4 on a piece of paper or calculator, you will get what Jannie got. (15.416). Mack would have been right if the equation was 1 2/3 times 11 1/4.

Solve using quadratic formula x^2+8x=7

Answers

For this case we have the following quadratic equation:

$x ^ 2 + 8x = 7\nx ^ 2 + 8x-7 = 0$

Where:

$a = 1\nb = 8\nc = -7$

We find the solution by:

$x = \frac {-b \pm \sqrt {b ^ 2-4 (a) (c)}} {2a}$

Substituting the values we have:

$x = \frac {-8 \pm \sqrt {8 ^ 2-4 (1) (- 7)}} {2 (1)}\nx = \frac {-8 \pm \sqrt {64 + 28}} {2}\nx = \frac {-8 \pm \sqrt {92}} {2}\nx = \frac {-8 \pm \sqrt {2 ^ 2 * 23}} {2}\nx = \frac {-8 \pm2 \sqrt {23}} {2}\nx = -4 \pm \sqrt {23}$

Thus, we have two roots:

$x_ {1} = - 4+ \sqrt {23}\nx_ {2} = - 4- \sqrt {23}$

Answer:

$x_ {1} = - 4+ \sqrt {23}\nx_ {2} = - 4- \sqrt {23}$

The median of a set of data is______ equal to the mean.

( Always, Sometimes, or Never)

Answers

The median of a set of data is sometimes equal to the mean.It depends on the set of data.
A mean is the average of the set of data.
A median is the middle value.

never equal to the mean. it is 2 different things the median is the middle number the mean is the adverage numeral u add up all the numerals and divide them by the number of the numeralals

Chase collects $27.34 for a fundraiser Sydney collects$9.83 more than Chase ally collects 4times as much as Sydney. how much does ally collects. please explain by step by step guide me to

Answers

So Chase has $27.34.
You add $27.34 to $9.83. (Which is $37.17).
That will give you the amount of how much Sydney has.
To find how much Ally has you times $37.17 by 4.
Basically, you are doing $37.17 + $37.17 + $37.17 + $37.17.
When you have finished adding them you will get the answer.
So the answer is $148.68

Chase collects $27.34 and Sydney got $9.83 more. So you add $27.34 and 9.83 given Sydney a total of $37.17. Therefore if Ally collected 4 times more than Sydney you will multiply $37.17 by 4 given Ally a total of $148.68

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Match the pairs of polynomials to their products. (xy + 9y + 2) and (xy – 3) x2y2 + 3x2y – 7xy – 27x – 18 (2xy + x + y) and (3xy2 – y) 6x2y3 – 2xy2 + 3x2y2 – xy + 3xy3 – y2 (x – y) and (x + 3y) x3y + 3x2 + 3x2y2 + 7xy – 6 (xy + 3x + 2) and (xy – 9) x2 – 9y2 (x2 + 3xy – 2) and (xy + 3) (x + 3y) and (x – 3y)