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const2013 [10]
3 years ago
5

Solve for x: 3x-18=42

Mathematics
2 answers:
Vikentia [17]3 years ago
8 0
Add 18 to 42, which equal 60. so
18 + 42 = 60
meaning 3x = 60
so x = 20 (:
k0ka [10]3 years ago
4 0
The answer is x= 20.

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Trig work i don’t understand. pls help
Naily [24]

Answer: A

Step-by-step explanation:

So we know that to find the area of a triangle you have to multiply the base times the height and divide it by two or multiply it by 1/2.Looking the information given it say that theta is equal to 26 degrees  and the length of a or the hypotenuse is 25 and b which in this case is the base is 32. So the information gives us the base but now we need to find the height.

To find  H we need to apply trigonometry solve for h the height.

As we could see theta which is 26 degrees is opposite the height and we know the hypotenuse length. So using soh cah toh we have to know that the length of h is  going to be using the sin formula opposite over hypotenuse.

sin(26)=\frac{h}{25}    solve for h by multiplying both sides by 25.

h= 25 sin(26)

h= 10.96   is being rounded to the nearest hundredth because that is essential

Now we know H is equal to 10.96  which is the Height so now we have all the information we need the height and the base.

Multiply 10.96 by 32 and divide it by 2.

10.96 * 32 =  350.72

350.72 /2 = 176.36  

The best answer is A  because that is the only best approximation to 175.35.

8 0
3 years ago
What is the exact value of sin(105°)?<br><br><br>ANSWER - D) sqrt(2 + sqrt3)/2
Fofino [41]

Answer:

\sin 105^{\circ} = \frac{\sqrt{6}+\sqrt {2}}{4}

Step-by-step explanation:

We can use the following trigonometrical identity:

\sin (\alpha - \beta) = \sin \alpha \cdot \cos \beta - \cos \alpha \cdot \sin \beta (1)

Where \alpha, \beta are angles, measured in sexagesimal degrees.

If we know that \alpha = 135^{\circ} and \beta = 30^{\circ}, then the value of the given function is:

\sin 105^{\circ} = \sin 135^{\circ}\cdot \cos 30^{\circ} - \cos 135^{\circ}\cdot \sin 30^{\circ}

\sin 105^{\circ} = \left(\frac{\sqrt{2}}{2} \right)\cdot \left(\frac{\sqrt{3}}{2}\right)-\left(-\frac{\sqrt{2}}{2} \right)\cdot \left(\frac{1}{2}\right)

\sin 105^{\circ} = \frac{\sqrt{6}}{4}+\frac{\sqrt{2}}{4}

\sin 105^{\circ} = \sqrt{\frac{6}{16} }+\sqrt{\frac{2}{16} }

\sin 105^{\circ} = \sqrt{\frac{3}{8} }+\sqrt{\frac{1}{8} }

\sin 105^{\circ} = \frac{\sqrt{3}+1}{2\cdot \sqrt{2}}

\sin 105^{\circ} = \frac{\sqrt{6}+\sqrt {2}}{4}

7 0
3 years ago
Find the sum of all two digit whole numbers which are divisible by 11?​
tensa zangetsu [6.8K]

Answer:

all two digit whole number which are divisible by 11 are

22+33+44+55+66+77+88+99=484

7 0
3 years ago
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The ratio of the number of tools Victor has to the number of tools Ilya has is 5:2. Victor has 42 more tools than Ilya. How many
Ulleksa [173]

Answer: 28

Step-by-step explanation: In the ratio 5:2 victor has 3 more parts than ilya. this means 3 parts is equal to 42 tools, so 1 part equals 14 tools. To change the ratio to 3:4 victor must give 2 parts to ilya. 2 times 14 is 28.

4 0
3 years ago
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A zoo has two male lions one sixth of the lions are male lions how many lions are there at the zoo
bezimeni [28]
2 = 1/6 so 6 times two equals 12. 2 is 1/6 of 12, there are 12 lions.
4 0
3 years ago
Read 2 more answers
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