All categories

3 years ago

School pennants cost $18 each. Ms. Lee says she will pay $146 for 7 pennants. Is her answer reasonable? Explain.

Mathematics

2 answers:

devlian [24]3 years ago

5 0

Yes, because 18 times 7 = 126. so she will still have $20 left over.

Vika [28.1K]3 years ago

3 0

Im going to say no because 18 multiplied by 7 is equal to 126 when Ms. Lee is buying the pennants for 146

You might be interested in

Determine which numbers the equations can be multiplied by to create opposite terms of the x-variable. 1 2 x − 1 4 y = −3 − 1 3

Julli [10]

In the elimination method one variable is eliminated from the system of equation to find the value of other.

To create the opposite terms of the x-variable-

First equation be multiplied by the number 12.
Second equation be multiplied by the number 13.

<h3>What is elimination method?</h3>

To solve the system of equation and find the value of the variables, the elimination method is used.

In this method one variable is eliminated from the system of equation to find the value of other.

Given information-

The system of equation given in the problem is,

$12x-14y=-3$ ......1

Let the above equation as equation 1.

The second equation given in the problem is,

$-13x+23y=5$ ......2

Let the above equation as equation 2.

To eliminate the x term, make the coefficient of x of both the equation equal.

It can be done by multiply the coefficient of x term of first equation to second equation and coefficient of x term of second equation to first equation.

As the coefficient of x of the equation 1 is 12. Thus multiply second equation with 12. Thus,

$12\times(-13x+23y)=12\times5$

$-156x+276y=60$ ........3

Multiply equation 1 with -13 to make the coefficient of x opposite. Thus,

$13\times(12x-14y)=13\times(-3)\\156x-182y=-39$ .......4

Hence, to create the opposite terms of the x-variable-

First equation be multiplied by the number 12.
Second equation be multiplied by the number 13.

Learn more about the elimination method here;

brainly.com/question/7013345

7 0

2 years ago

Read 2 more answers

Sarah found the mean of a set of numbers to be 205.09.how should she read this value out loud?

Elena-2011 [213]

Two hundred and 5, point zero nine or 0 9

6 0

3 years ago

Read 2 more answers

A 30 feet tall building casts a 5 foot shadow. what is the suns angle of inclination

ohaa [14]

Make a drawing of the situation:

Recalling the tangent trigonometric relationship, if the angle of inclination is A, then:

$\begin{gathered} \tan (A)=\frac{30\text{ feet}}{5\text{ feet}} \\ \Rightarrow\tan (A)=6 \end{gathered}$

Use the inverse tangent function to find the value of A:

$A=\tan ^{-1}(6)$

Use a calculator to find the numerical value of the inverse tangent of 6:

$A=80.52767779\ldots$

Therefore, the angle of inclination of the Sun is approximately 80.5°.

8 0

1 year ago

Titanium-44 is a radioactive isotope such that every 63 years, its mass decreases by half. For a sample of titanium-44 with an i

Darina [25.2K]

Answer:

Function= T=K/M

Mass of Sample after 40 yrs = 31.746032 grams

Step-by-step explanation:

As time increases, the mass decreases, hence it's inverse proportion

T ∝ 1/M

Function = T = K/M

Using direct proportion to evaluate mass after 40 yrs

when T= 63yrs, Mass = 0.5M

When T = 40 yrs Mass = X

X = 0.3174603M

Hence mass after 40 years = 0.3174603(100) = 31.746032 grams

5 0

3 years ago

What is the part and whole of 40% of 20?

pashok25 [27]

The answer is 8

I hope this helps!

5 0

3 years ago