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2 years ago

I need help with this

Mathematics

1 answer:

Nataly_w [17]2 years ago

6 0

Answer: 72 units^2

Explanation:
Triangle to the left, you do 5(6) and get 30, but since it's a triangle, you divide by 2 and get 15. Middle rectangle, 6(8) is 48. Right triangle, 3(6) is 18, 18/2 is 9. Add them all up 15+48+9 and you get 72. Hope this helped!

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−3(2+4k)+7(2k−1) eqivalent expression

Alex17521 [72]

Answer:

$\large\boxed{-3(2+4k)+7(2k-1)=2k-13}$

Step-by-step explanation:

$-3(2+4k)+7(2k-1)\qquad\text{use the distributive property}\ a(b+c)=ab+ac\\\\=(-3)(2)+(-3)(4k)+(7)(2k)+(7)(-1)\\\\=-6-12k+14k-7\qquad\text{combine like terms}\\\\=(-12k+14k)+(-6-7)\\\\=2k-13$

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3 years ago

The radius of a circle 6 cm what is the circles area?

dolphi86 [110]

Answer:

113.04 cm

Step-by-step explanation:

We know the formula to find the area of a circle is

$A= pi(r^{2})$

And we are told to use 3.14 instead of pi so what we have now is,

$A=3.14(r^{2})$

We are also told the radius, r, is 6. So our equation now looks like this,

$A=3.14(6^{2})\\\\6^{2}$ is the same as 36, because 6x6 is 36.

Now we have,

$A=3.14(36)$

Which equals 113.04 and that is the area!

Hope that helps and have a great day!

7 0

3 years ago

What is the derivative of this

skelet666 [1.2K]

$\bf r(x)=\cfrac{3x-2}{2x+5}\implies \cfrac{dr}{dx}=\stackrel{quotient~rule}{\cfrac{3(2x+5)~~-~~(3x-2)2}{(2x+5)^2}}
\\\\\\
\cfrac{dr}{dx}=\cfrac{\underline{6x}+15\underline{-6x}+4}{(2x+5)^2}\implies \cfrac{dr}{dx}=\cfrac{19}{(2x+5)^2}$

7 0

3 years ago

0=(x+2) squared minus 25

hichkok12 [17]

Answer:

x=3

Step-by-step explanation:

0=(x+2)^2-25

+25 +25

25=(x+2)^2

Square root both sides to get:

5=x+2

-2 -2

3=x

8 0

2 years ago

Read 2 more answers

A bottle contains 2 quarts of cooking oil. A chef uses 1/12 quart of cooking oil each day. How many days will the bottle of cook

klio [65]

It would last 24 days

7 0

3 years ago

I need help with this ​

I need help with this