In 1990 it would have cost $3.70 to send 13 postcards and 7 letters. It would have cost
$2.65 to send 6 postcards and 7 letters. How much did it cost to send a letter in 1990?

Answer:

The solution of r² is r² = [tex]\frac{A}{\pi }[/tex]

Step-by-step explanation:

To solve an equation for one of its variables, do that

Let us solve the question

∵ The formula of the area of the circle is A = π r²

∵ The subject is r² ⇒ The variable which we need to solve for it

→ By using the 1st step up divide both sides by π to move it from the right

   side to the left side

∵ [tex]\frac{A}{\pi }[/tex] = [tex]\frac{\pi r^{2}}{\pi }[/tex]

∴ [tex]\frac{A}{\pi }[/tex] = r²

→ Switch the two sides

∴ r² = [tex]\frac{A}{\pi }[/tex]

Answer:

LM = 11 units

Step-by-step explanation:

Given M  is on LN , then

LM + MN = LN , substitute values

2x + 7 + 3x = 4x + 9

5x + 7 = 4x + 9 ( subtract 4x from both sides )

x + 7 = 9 ( subtract 7 from both sides )

x = 2

Thus

LM = 2x + 7 = 2(2) + 7 = 4 + 7 = 11

Answer:

Tax amount = $15.00 x 0.06 =0.9

Total amount of the basketball = $15.00 x 1.06 = $15.90

Answer:

Tax amount = $15.00 x 0.06 =0.9Total amount of the basketball = $15.00 x 1.06 = $15.90

Step-by-step explanation:

Answer:

number 1 doesn't lie on the graph

Step-by-step explanation:

and I don't really have an explanation

Answer:

x=50 y=25

Step-by-step explanation:

brainliest pls

Answer:

y=1/2x

Step-by-step explanation:

Find the slope of the original line and use the point-slope formula y−y1=m(x−x1) to find the line parallel to y=1/2x−8

I know this isn't much but please don't report me. I got this answer ):

Answer:

y = [tex]\frac{1}{2}[/tex]x + 8

Step-by-step explanation:

Since lines that are parallel to each other must have the same gradient,

m = [tex]\frac{1}{2}[/tex]

Answer:45 degrees

Step-by-step explanation: The opposite angles theorem

Answer:

45

.................. . ...

The solution is, 12s + 5.04 = 15.48, is the equation which could you use to find the value of s.

An equation is a  mathematical statement that is made up of two expressions connected by an equal sign.  In its simplest form in algebra, the definition of an equation is a mathematical statement that shows that two mathematical expressions are equal.

here, we have,

given that,

Jacy paid $15.48 to download 12 songs last month.

She paid the same amount for each song and also had to spend $5.04 to enroll in the music purchasing program.

now, we have,

Let s represent the amount that Jacy paid for each song she downloaded.

so, we get,

She paid the same amount for each song and also had to spend $5.04 to enroll in the music purchasing program.

i.e. 12s + 5.04

and, Jacy paid $15.48

i.e. the equation which could you use to find the value of s is,

12s + 5.04 = 15.48

Hence, The solution is, 12s + 5.04 = 15.48, is the equation which could you use to find the value of s.

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Answer:

linear

Step-by-step explanation:

linear means that is gains and loses in a straight line. if you were to graph the points on a chart the line will be straight

you can see in set 1 there is one ball

1:1

set 2 is 2 balls

2:2

and set 3 is 3 balls

it increases at a steady rate

therefore it is linear

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Answer:

[tex]150\:\mathrm{cm}[/tex]

Step-by-step explanation:

Let [tex]x[/tex] represent the length of the official scale model. We can set up the following proportion:

[tex]x\cdot 0.04=6[/tex].

Solving, we get:

[tex]x=\frac{6}{0.04}=\fbox{$150\:\mathrm{cm}$}[/tex].

Answer:

its

Step-by-step explanation:

i cant explane

Answer:

£120 : £200

Step-by-step explanation:

sum the parts of the ratio, 3 + 5 = 8 parts

Divide the amount by 8 to find the value of one part

£320 ÷ 8 = £40 , then

3 parts = 3 × £40 = £120

5 parts = 5 × £40 = £200

Then £320 in the ratio 3 : 5 is £120 : £200

The division of  £320 in the ratio of 3: 5 is £120: £200.

Arithmetic operators are four basic mathematical operations in which summation, subtraction, division, and multiplication involve.,

Summation = addition of two or more numbers or variable

For example = 2 + 8 + 9

Subtraction = Minus of any two or more numbers with each other called subtraction.

For example = 4 - 8

Division = divide any two numbers or variable called division.

For example 4/8

Multiplication = to multiply any two or more numbers or variables called multiplication.

For example 5 × 7.

Given the amount of £320

Now,

The ratio is 3: 5 so divide 320 by 3 + 5 to find the per unit ratio value.

So,

320/8 = 40

Now,

Multiply by 3 ⇒ 3 × 40 = 120

Multiply by 5 ⇒ 5 × 40 = 200

So ratio 120/200 = £120: £200.

Hence "The division of  £320 in the ratio of 3: 5 is £120: £200".

To learn more about the arithmetic operators,

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Answer:

do you have more info so I can help

Answer:

43.75 percent decrease

Step-by-step explanation:

caslan?

Answer:

adam i got banned on insta

Step-by-step explanation:

Answer: t-8 < -12

Step-by-step explanation:

Answer: who knows

Step-by-step explanation:

Answer:

The equation of the desired line is thus y = 4

Step-by-step explanation:

A line parallel to y = 5 is a horizontal line.  The x-coordinate of every point on this line can take on any x-value; the y-coordinate is always 5.

The line that passes through the point (1, 4) has the constant y-coordinate 4, whereas x can take on any value.

The equation of the desired line is thus y = 4; this line passes through (1, 4) as required and is parallel to y = 5.

Answer:

slope: 3/2, y-intercept: (0,1/2)

Step-by-step explanation:

Graph the line using the slope and y-intercept, or two points.

Answer:

coordinates of point f are 2,1 coordinates of point g are 5,6

Step-by-step explanation:

Answer:

=−1.9d+3.2h−13

Step-by-step explanation:

hope it helps and have a good day

Answer: This is not a function

======================================================

Explanation:

If x = 1, then,

x = |y|

1 = |y|

|y| = 1

y = plus/minus 1

y = 1 or y = -1

The input x = 1 leads to more than one output y = 1 and y = -1 at the same time.

Similar situations occur with x = 2 and x = 3.

This means we do not have a function. A function can only be possible if each input leads to exactly one output.

Answer:

-7

Step-by-step explanation:

x-y=7

-y=-x+7

y=x-7

hope it helps

Answer:

9 Feet

Step-by-step explanation:

Lets start with a ratio:

1:3

Now lets look at the other ratio:

3:?

If the 1 turned into a three in the second ratio, then what will the 3 in the first ratio turn into?

9!

Because 1x=3 should be equivalent to 3x=9

Lets check our work:

x=3

3x=9

Simplify by dividing by 3 on both sides:

x=3

x=3

It worked!

The answer is 9 feet. If the air hockey table is 3 inches long and 1 inch = 3 feet, 3 x 3 = 9.

Step-by-step explanation:

Remember the Difference of Squares:

a² - b² = (a + b)(a - b)

Therefore (√20 - √3)(√20 + √3)

= (√20)² - (√3)² = 20 - 3 = 17. (C)