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3 years ago

6.5+(-8.3)-(-1.6)+0.7-9.9

Mathematics

1 answer:

german3 years ago

6 0

Answer:

-12.6

Step-by-step explanation:

OK so I might have done something wrong but just remember when you're adding a negative and and a positive number you're technically just subtracting

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Please help! I’ll also give brainliest! Thank you!

kenny6666 [7]

Answer:

The solution is in the attached file

8 0

3 years ago

Read 2 more answers

Find the diameter of a sphere with a surface area of 196π square centimeters

aleksandr82 [10.1K]

$\textit{surface area of a sphere}\\\\ SA=4\pi r^2 ~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ SA=196\pi \end{cases}\implies \begin{array}{llll} 196\pi =4\pi r^2\implies \cfrac{196\pi }{4\pi }=r^2 \implies 49=r^2 \\\\\\ \sqrt{49}=r\implies 7=r~\hfill \underset{diameter}{\stackrel{2(7)}{14}} \end{array}$

7 0

2 years ago

What's the answer for the attachment

gulaghasi [49]

ABC is not a right angled triangle

Solution:

Given that, Triangle ABC has perimeter 18 cm

AB = 7 cm

BC = 3 cm

We have to find whether ABC is a right angled triangle

Let the sides of triangle be AB, BC, AC

Perimeter of triangle is given by formula:

perimeter = sum of length of all three sides of triangle

18 = AB + BC + AC

18 = 7 + 3 + AC

AC = 18 - 10

AC = 8

Thus the length of sides of triangle are:

AB = 7 cm

BC = 3 cm

AC = 8 cm

For a triangle to be right angle, it must satisfy the pythagoras theorem

Pythagorean theorem, states that the square of the length of the hypotenuse is equal to the sum of squares of the lengths of other two sides of the right-angled triangle.

The longest side of triangle is hypotenuse

Therefore, AC = 8 cm is the hypotenuse

Thus by above theorem we get,

$AC^2 = AB^2+BC^2$

Substituting the values we get,

$8^2 = 7^2 + 3^2\\\\64 = 49 + 9\\\\64 \neq 58$

Thus the pythagoras theorem is not satisfied

Thus ABC is not a right angled triangle

6 0

3 years ago

A pet store employee counts 23 heads and 68 feet on the animals in the store. The store currently only has kittens and parakeets

Aloiza [94]

Answer:

11 kittens and 12 parakeets

Step-by-step explanation:

each kitten has 4 feet while each parakeet has 2

11 x 4 = 44 (kittens)

12 x 2 = 24 (parakeets)

11 + 12 is 23 which is your 23 heads.

44 + 24 is 68 which would be your feet

4 0

2 years ago

!!!HELP!!! PLEASE SHOW WORK SO I CAN UNDERSTAND!

ss7ja [257]

The only part of this problem that's the least bit tricky is knowing
the formula for the volume of a sphere. Here is is:

Volume of a sphere = (4/3) (pi) (radius of the sphere)³ .

Everything else is just arithmetic.

pi . . . use 3.14
Radius . . . 2-1/8 inches. It'll be easier if we write that as 2.125 inches.

Now, just put the numbers into their places in the formula:

Volume = (4/3) (pi) (radius of the sphere)³

= (4/3) (3.14) (2.125)³

and run that through your calculator.

When I run it through mine, I get 40.174 in³ .

None of the choices is anywhere near that number.
I'm worried, and I don't understand that.

Maybe we should look back at the question, and notice that
it says "estimate" ... something you do quickly in your head.

OK. We know the real formula ... Volume = (4/3) (pi) (radius)³ .
How could we estimate this quickly in our head?

pi . . . instead of 3.14, just use 3

radius . . . instead of 2-1/8, just use 2 . Then (radius)³ = 2 x 2 x 2 = 8

Then (4/3) (pi) (radius)³ = (4/3) (3) (8) = (4/3) of 24 = 32 .

Well now, will you look at that ! I guess that's where the 32 came from
on the list of choices.

6 0

3 years ago