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denpristay [2]
3 years ago
13

The value of the expression 30 - 3x3

Mathematics
1 answer:
BaLLatris [955]3 years ago
3 0

Answer:

<em>21</em>

Step-by-step explanation:

<em>30-(3*3)</em>

<em>Follow the rule:</em>

<em>PEMDAS</em>

<em>parenthesis, exponents, multiplication, division, addition, subtraction.</em>

<em>Since we know that multiplication comes first before subtraction in PEMDAS, we do multiplication first. We can also put PARENTHESES around (3*3) because the multiplication comes first.</em>

<em>So:</em>

<em>30-(6)=</em>

<em>21!</em>

Hope this helps, have a good day. c;

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aliina [53]
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In triangle ABC, ∠CBA = 90°, therefore in triangle BCD ∠CBD = 90° also.

Since ∠BDC = 55°, ∠CBD = 90°, and there are 180 degrees in a triangle, we know ∠DCB = 180 - 55 - 90 = 35°

In order to find ∠BCA, use the law of sines:
 
sin(∠BCA)/BA = sin(∠CBA)/CA
sin(∠BCA)/6 cm = sin(90)/12 cm
sin(∠BCA) = 6*(1)/12 = 0.5
∠BCA = arcsin(0.5) = 30° or 150°
We know the sum of all angles in a triangle must be 180°, so we choose the value 30° for ∠BCA

Now add ∠BCA (30°) to ∠DCB = 35° to find ∠DCA.
∠DCA = 30 + 35 = 65°

Since triangle DCA has 180°, we know ∠CAD = 180 - ∠DCA - ∠ADC = 180 - 65 - 55 = 60°

In triangle DCA we now have all three angles and one side, so we can use the law of sines to find the length of DC.

12cm/sin(∠ADC) = DC/sin(∠DCA)
12cm/sin(55°) = DC/sin(60°)
DC = 12cm*sin(60°)/sin(55°)
DC = 12.686 cm
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3 years ago
The vertical number line on the Coordinate Plane<br> is called the
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Answer: y axis

Just think the yo yo goes up and down

Step-by-step explanation:

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3 years ago
There are 32 students in Joe's class. Of the 32 students, 8 students ride their bikes to school, 5 walk to school, 4 ride to sch
vampirchik [111]

Answer:

5/32 (aka option A) should be the correct answer!

Step-by-step explanation:

ok so... its 5/32 who walks to school!

since there are 5 students who walked to school, and 32 students are in the class, 5/32 should be the correct answer!

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3 years ago
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3 years ago
Solve for z: 11=6|-2z| -5
skad [1K]

Answer:

the roots are {-4/3, 4/3}

Step-by-step explanation:

Begin the solution of 11=6|-2z| -5 by adding 5 to both sides:

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Dividing both sides by 12 yields

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There are two cases here:  first, that one in which z is positive and second the one in which z is negative.

If z is positive, 4/3 = -z, and so z = -4/3, and:

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3 years ago
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