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3 years ago

Only for (a) please!

Mathematics

1 answer:

Bas_tet [7]3 years ago

3 0

Answer:

Efx=2300 may be it would help : )

Step-by-step explanation:

To find that u have to :

mass mid value(x) Number..(f) fx

10-29 19 32 608

30-39 9 38 342

40-49 9 64 576

50-59 9 35 315

60-69 9 22 198

70-99 29 9 . 261

Efx=2300

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the scale on a map is 1 : 15000 how many kilometers on the ground would be represented by 12 cm on the map?

Sergeu [11.5K]

Answer:

1.8 km

Step-by-step explanation:

The scale on the map is 1 : 15000.

This means that every 1 cm on the map is equal to 15000 cm on the ground.

12 cm on the map will therefore be:

12 * 15000 = 180000 cm

Let us convert to kilometres:

100000 cm = 1 km

180000 cm = 180000 / 100000 = 1.8 km

12 cm on the map will be 1.8 km on the ground.

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4 years ago

The supplement of a angle 30 degrees less than twice the measure of the angle itself. Find the angle and supplement

In-s [12.5K]

Answer:

The angle: $70\°$

The supplement: $110\°$

Step-by-step explanation:

By definition, if the sum of two angles is 180 degrees, then this angles are called "Supplementary Angles".

Let be:

$x$ the angle (in degrees) and $2x-30$ its suppplement (in degrees).

Therefore, you can write the following equation in order to find the angle and its supplement:

$x+2x-30=180$

Now, you must solve for "x". Then:

$3x=180+30\\\\x=\frac{210}{3}\\\\x=70$

Then:

$2x-30=2(70)-30=140-30=110$

7 0

4 years ago

Read 2 more answers

In a class 20 of students, 7 have a cat and

blsea [12.9K]

Answer:

$\frac{3}{20}$

Step-by-step explanation:

Since there are 20 students, this will be the denominator.

Now, to find how many students have a dog and a cat, you need to subtract all the numbers with 20. The leftover number will be the amount of students.

7+8+8=23

23-20=3

So, there are 3 students who have a dog and a cat.

So, the fraction will be $\frac{3}{20}$

8 0

3 years ago

If f(x)=3x+5/x, what is f(a+2)?<br><br> A. 3(f(a))+5/f(a)+2<br> B. 3a+5/a+2<br> C. 3(a+2)+5/a+2

natali 33 [55]

f(x) = 3x + 5/x

f(a + 2) = 3.(a + 2) + 5/(a + 2)

Alternative C.

5 0

3 years ago

Giving brainliest *easy*

Evgesh-ka [11]

Answer:

Step-by-step explanation:

to convert angles to radians you must multiply the angle measurement by the formula pi/180

180 x pi/180

the 180s cancel out and you are left with pi

3 0

3 years ago