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3 years ago

What is the value of r in (3r+4) ° (8r-2

Mathematics

1 answer:

lana66690 [7]3 years ago

8 0

Answer:

r = 49

Step-by-step explanation:

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(2.5×10−8)(9×10−10) Express your answer in scientific notation.

Lunna [17]

Answer: 2.25x $10^{-17}$

Scientific notation is used in science because the number can be vary from so much that using decimal is making it hard. The number expressed in $10^{x}$ form. Both number in the question is already in scientific notation. Then to multiply the number and keep it at scienfitic notation the calculation should be:

2.5 x $10^{-8}$ x 9 x $10^{-10}$ = 22.5 x $10^{-18}$ = 2.25x $10^{-17}$

6 0

3 years ago

Read 2 more answers

2. What is the length of the horizontal line segment joining points C(-9,205) and D(4,205)?

arsen [322]

Answer:

13 unit

Step-by-step explanation:

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3 0

3 years ago

Tan(-212°)=____. 1. -cot 32° 2. tan 32° 3. cot 32° 4. -tan 32°

Marrrta [24]

Answer:

4. $-\tan 32$ °

Step-by-step explanation:

Given:

The tangent of the angle is given as:

$\tan (-212\°)$

Since the angle is negative, it means that it is measured in the clockwise direction as angles measured in clockwise direction are negative and that measured in counter clockwise directions are positive.

-212° when measured from counter clockwise direction will be equal to:

$-212\°(Clockwise)=360-212=148\°(CCW)$

Therefore, $\tan (-212\°)$ = $\tan (148\°)$

Now, we have the identity for tan as:

$\tan(\pi-\theta)=-\tan \theta$

Here, $\theta=148\°$

Therefore,

$-\tan (148\°)=\tan(180-148)\\-\tan(148\°)=\tan(32\°)\\\textrm{Multiplying both sides by -1, we get:}\\-1(-\tan(148\°)=-1\times \tan(32\°)\\\\\tan(148\°)=-\tan(32\°)$

Hence, $\tan (-212\°)$ = $\tan (148\°)$ = $-\tan 32$ °

5 0

3 years ago

Anyone help me this is my final exam please i dont havee timeee

d1i1m1o1n [39]

Both lines intersect at the point
(-0.5, 0.5)

5 0

3 years ago

What is the answer to the math problem 18 minus 4x = negative 2?

pentagon [3]

The answer to this equation is 5.

3 0

3 years ago