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Dovator [93]
3 years ago
11

Could someone help me on 6 7 and 8? So confused!!!!

Mathematics
1 answer:
Radda [10]3 years ago
5 0
7. We know that they must all add up together to get 90 degrees because of the symbol show the right angle. 
We can use this to form and solve an equation:
2x +1x + 30 = 90
3x+30 = 90  (add the x's together)
3x = 60    (subtract both sides by 30 to get the x's alone)
x =20  (divide by 3 to get what 1x is equal to)

(The next question is very similar)
8. To solve this, we need to know what all the x's together are equal to.
Since angles on a straight line add up to 180 degrees -we can make an equation:
4x+x+30 = 180 
5x + 30 +180  (add all the x's together)
5x = 150  (subtract both sides by 30 to get what 5x is equal to)
x = 30 (divide by 5 to get what just 1x is)

Hoped this helped - please ask if anything doesn't make sense!
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3x to the power of 3 + 21x squared + 36x = 0 by factoring the quadratic equation.
Diano4ka-milaya [45]

Answer:

x = 0, -4 and -3.

Step-by-step explanation:

The given expression is "3x to the power of 3 + 21x squared + 36x = 0".

We can write this expression as follows :

3x^3+21x^2+36x=0

Taking 3x common.

3x(x^2+7x+12)=0\\\\3x=0\ \text{and}\ (x^2+7x+12)=0

x = 3

x^2+7x+12=0\\\\x^2+3x+4x+12=0\\\\x(x+3)+4(x+3)=0\\\\(x+4)(x+3)=0\\\\x=-4,-3

Hence, the solution of the given quadratic equation are x = 0, -4 and -3.

5 0
3 years ago
Please help me simplify these expressions
Fantom [35]

Answer:

1.  -18x¹¹

2.  3n⁷

Step-by-step explanation:

For these problems, there are two things you need to worry about: negative signs and exponents.

1. Let's look at the signs first.  There is only one value with a negative sign, meaning that the negative sign will stay.

When multiplying with exponents, you have to add up the exponents.  Don't forget the numerical coefficients.

-3x² · 3x · 2x³ · x⁵ = -18x¹¹

2.  There are two negative signs in this probem, meaning that they will cancel out.  Multiply the rest like we did in the first problem.

3n² · -n² · -n³ = 3n⁷

7 0
3 years ago
Can some one give me the answers to the slope questions please ?!
viktelen [127]

Answer:

I gotchu homie:

1. Slope = 5

2. Slope = 2/3

3. Slope = 3/4

4. Slope = 5/2

If you want to understand how to find them feel free to ask :)

4 0
3 years ago
What’s bigger kbps or mbps?
leva [86]

KBPS is larger than MBPS.

1 KBPS =  0.001 MBPS

6 0
3 years ago
Read 2 more answers
A survey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand X aspirin. How many doctors use brand X aspirin
swat32
You would use cross multiplication:

X/2,000 = 3/5
Multiply: 2,000*3= 6,000
Divide: 6,000/5
Answer: 1,200 doctors use brand x
8 0
3 years ago
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