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3 years ago

What is the simplest form of this expression -2b(-5b+4)-4b^2

Mathematics

1 answer:

Nostrana [21]3 years ago

5 0

Answer:

-23b + 4

Step-by-step explanation:

Add the like terms. those would be: -2b - 5b -4b2 notice they all have a b in it. Its like having x amount of bananas and 4 apples, they arent the same, so you cant add those together. Use our handy dandy tiger algebra website and we get -23b. We still have the 4, so, -23b + 4. Thats your answer.

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1/7 rounded to 2 decimal places

dmitriy555 [2]

Answer:

0.14

Step-by-step explanation:

1/7 = 0.142

Since 2<5 the answer is 0.14.

5 0

3 years ago

How do you solve this?

alekssr [168]

Answer:

84 ft or 84.474

Step-by-step explanation:

46.93 ft/sec * 1.8 sec = 84 ft

Explanation:

The reason you can use simple multiplication is because of the units:

46.93 f t/ sec ⋅ 1.8 sec would equal 84.474 f t ⋅ sec/ sec

however the seconds cancel out, leaving you with just the distance traveled.

The reason the answer is 84 instead of 84.474 is because the number 1.8 only contains two significant figures

Hey love thanks for reposting this so we can see it better! i hope this answers your question if it doesn't let me know se i can better help you understand. Thank you! have a wonderful day and good luck in this class you can do it just keep trying! :)

6 0

3 years ago

Solve the triangle. Round side measure to the nearest tenth and angle measures to the nearest degree.

shutvik [7]

First calculate the missing angle $\alpha$ . By knowing all angles in triangle have a sum of 180°.

$\alpha=180-(\gamma+\beta)$
$\alpha=180-(90+49)=\boxed{41}$

Now we required to use angle functions in a right triangle. The cosine of $\beta$ is equal to the relation of side $a$ and hypotenuse $c$ .

Now we solve this for hypotenuse.

$\cos(\beta)=\frac{a}{c}$

$c=\frac{a}{\cos(\beta)}$

Now put in the numbers.

$c=\frac{9}{\cos(49)}\approx\boxed{13.7}$

So we know the length of hypotenuse and length of side $a$ therefore side $b$ can be calculated using Pythagorean theorem: $c^2=a^2+b^2$ .

Solve for side $b$ .

$c^2=a^2+b^2$

$b=\sqrt{c^2-a^2}$

$b=\sqrt{13.7^2-9^2}\approx\boxed{9.7}$

So there you go. If you have any questions feel free to ask.

r3t40

6 0

4 years ago

Solve for x. X + 5 = 2x OX=3 OX=-3 OX=-5 Ox=5

Alisiya [41]

Isolate the variable by dividing each side by factors that don't contain the variable.
X = 5

4 0

4 years ago

III

docker41 [41]

Answer:

8x+6=-8

x=-1,75

Step-by-step explanation:

8x+6=-8

8x=-8-6

8x÷8=-14÷8

x=1,75

3 0

3 years ago