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3 years ago

I’m not really sure how to work this out can someone plssss help me

Mathematics

1 answer:

Blizzard [7]3 years ago

6 0

Answer:

Perimeter of the rectangle=Perimeter of the trapezium

2{(3x+4)+(4x)}=2(5x)+(x-3)+(7x-3)

→2(7x+4)=10x+x-3+7x-3

→14x+8=18x-6

→4x=14

→x=7/2

→x=3.5

The value of x is 3.5 cm

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Which of the following is equivalent to 5x + 7 = 6y?

alexandr402 [8]

Answer:

Step-by-step explanation:

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4 years ago

a recipe calls for three cups of cheese to make nachos for six people .how much cheese is needed to make nachos for two dozen pe

zubka84 [21]

First, let's figure out how many cups of cheese we need for one dozen people.
There are 12 people in one dozen.

3 cups of cheese = x cups of cheese
6 people 12 people


that means we will need 6 cups of cheese for 12 people, or one dozen.

However, we want to make nachos for two dozen people.

6 cups of cheese for one dozen x 2 dozen = 12 cups of cheese

You need 12 cups of cheese to make nachos for two dozen people.

3 0

4 years ago

Read 2 more answers

A guitar string vibrates back and forth 88 times in 1 minute. what is its period in seconds?

Alchen [17]

Answer:

1.5 times per second

(1 time per second if rounded to a whole number)

Step-by-step explanation:

1 minuet is equal to 60 seconds

Because you are given 88 vibrations in one minute, you will divide 88 by 60 seconds. You want your answer in seconds.

88/60 gives us 1.466666667 on a calculator

So the guitar gives a vibration of 1.466666667 per second

If we round this, we get 1.5 vibrations per second

Or, if we round 1.4666 to a whole number then it is 1 vibration per second

4 0

3 years ago

Write the equation of a line that is perpendicular to the given line and that passes through the given point.

garri49 [273]

The quickest way is just to put the (-4,3) in all 4 and see for witch one you get the right answer:
so for y=-3x-9 if we put (-4,3) we have 3= -3*-4-9
3=12-9
3=3
which means this is the correct answer

4 0

3 years ago

Find the circumferences of the two circles circle a has a radius of 21 meters and circle b has a radius of 28 meters Is the rela

Feliz [49]

Answer:

The circumference for circle a is $\\ C = 131.9430$ m.

The circumference for circle b is $\\ C = 175.9240$ m.

The relationship between the radius of a circle and the circumference (the distance around the circle) is constant and is the same for all circles and can be written as $\\ \frac{C}{r} = 2\pi$ or, in a less familiar form, $\\ \frac{r}{C} = \frac{1}{2\pi}$ . The number $\\ \pi$ is constant for all circles and has infinite digits, $\\ \pi = 3.14159265358979....$ .

Step-by-step explanation:

The circumference of a circle is given by:

$\\ C = 2*\pi*r$ [1]

Where

$\\ C$ is the circle's circumference.

$\\ r$ is the radius of the circle.

And

$\\ \pi = 3.141592....$ is a constant value (explained below)

We can say that the distance around the circle is the circle's circumference.

The circumferences of the two circles given are:

Circle a, with radius equals to 21 meters ( $\\ r = 21m$ ).

Using [1], using four decimals for $\\ \pi$ , we have:

$\\ C = 2*\pi*r$

$\\ C = 2*3.1415*21$ m

$\\ C = 131.9430$ m

Then, the circumference for circle a is $\\ C = 131.9430$ m.

Circle b, with radius equals to 28 meters ( $\\ r = 28m$ ).

$\\ C = 2*3.1415*28$ m

$\\ C = 175.9240$ m

And, the circumference for circle b is $\\ C = 175.9240$ m.

We know that

$\\ 2r = D$

That is, the diameter of the circle is twice its radius.

Then, if we take the distance around the circle and we divided it by $\\ 2r$

$\\ \frac{C}{2r} = \frac{C}{D} = \pi$

This ratio, that is, the relationship between the distance around the circle (circumference) and the diameter of a circle is $\\ \pi$ and is constant for all circles. This result is called the $\\ \pi$ number, which is, approximately, $\\ \pi = 3.141592653589793238....$ (it has infinite number of digits).

We can observe that the relationship between the radius of a circle and the circumference is also constant:

$\\ \frac{C}{2r} = \frac{C}{D} = \pi$

$\\ \frac{C}{2r} = \pi$

$\\ \frac{C}{r} = 2\pi$

However, this relationship is $\\ 2\pi$ .

We can rewrite it as

$\\ \frac{r}{C} = \frac{1}{2\pi}$

And it is also constant.

7 0

3 years ago