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3 years ago

Solve for b. 3b+2(b-3)=4

Mathematics

1 answer:

aleksandrvk [35]3 years ago

3 0

The answer is b=2 because yea

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Help it's due tomorrow!!!!

zepelin [54]

8a^2 + 3a^2

11a^2

since both have a^2 you only have to add the coefficients

5 0

3 years ago

You and two friends plan to walk your dogs together. You want the meeting place to be the same distance from each person’s resid

AveGali [126]

If we join the points we are gonna end up with a triangle, from there by finding the centroid of the triangle we will get a point which is equidistant from all the three points given in the diagram.

Formula for Centroid:

6 0

2 years ago

It cost a farmer 43.60 pre acre to harvest corn. How much does it cost to harvest 1325.5 acres

KATRIN_1 [288]

Answer:

$57,791.8

Step-by-step explanation:

Each acre cost $43.60.

If the famer wants to harvest 1325.5 acres he has to pay 43.6 per acre

43.60×1325.5= 57,791.8

4 0

3 years ago

What is the area, in square centimeters, of triangle Z?

sveticcg [70]

9514 1404 393

Answer:

24 cm^2

Step-by-step explanation:

The base of ∆Z is 4 cm, and its height is 12 cm. The area is given by the formula ...

A = 1/2bh

A = 1/2(4 cm)(12 cm) = 24 cm^2 . . . area of Z

5 0

3 years ago

Show that cos(3x) = cos3(x) − 3 sin2(x)cos(x). (Hint: Use cos(2x) = cos2(x) − sin2(x) and the cosine sum

otez555 [7]

<u>Step-by-step explanation:</u>

To prove:

$\cos 3x=\cos^3x-3\sin^2 x\cos x$

Identities used:

$\cos(A+B)=\cos A\cos B+\sin A\sin B$ ......(1)

$\sin 2A=2\sin A\cos A$ ........(2)

$\cos 2A=\cos^2A-\sin^2 A$ .......(3)

Taking the LHS:

$\Rightarrow \cos 3x=\cos (x+2x)$

Using identity 1:

$\Rightarrow \cos (x+2x)=\cos x\cos 2x-\sin x\sin 2x$

Using identities 2 and 3:

$\Rightarrow \cos x(\cos ^2x-\sin^2 x)-\sin x(2\sin x\cos x)\\\\\Rightarrow \cos^3x-\sin^2x\cos x-2\sin^2 x\cos x\\\\\Rightarrow \cos^3x-3\sin^2x\cos x$

As, LHS = RHS

Hence proved

4 0

3 years ago