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3 years ago

30 ft

Mathematics

1 answer:

LekaFEV [45]3 years ago

4 0

Answer:30+15

Step-by-step explanation:

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In a class, 21 students have black hair, 11 students have blonde hair, 9 students have brown hair and 4 students have red hair.

tangare [24]

Total =45

Black hair=21*360/45=168
Blonde=11*360/45=88
Brown=9*360/45=72
Red=4*360/45=32

5 0

4 years ago

(-3)3 (26)

Lemur [1.5K]

Question:

Geoffrey is evaluating the expression (-3)^3(2^6)/(-3)^5(2^2) as shown below.

(-3)^3(2^6)/(-3)^5(2^2) = (2)^a/(-3)^b = c/d

What are the values of a, b, c, and d?

Answer:

The values are a = 4, b = 2, c = 16, d = 9

Solution:

Given that,

Geoffrey is evaluating the expression

$\frac{(-3)^3 \times 2^6}{(-3)^5 \times 2^2}$

He is evaluating as shown below:

$\frac{(-3)^3 \times 2^6}{(-3)^5 \times 2^2} = \frac{2^a}{-3^b} = \frac{c}{d}$

From given,

$\frac{(-3)^3 \times 2^6}{(-3)^5 \times 2^2}$

Use the law of exponent

$\frac{a^m}{a^n} = a^{m - n}$

Therefore,

$\frac{(-3)^3 \times 2^6}{(-3)^5 \times 2^2} = \frac{2^{6-2}}{(-3)^{5-3}}\\\\Simplify\\\\\frac{(-3)^3 \times 2^6}{(-3)^5 \times 2^2} = \frac{2^4}{-3^2}$

Thus,

a = 4

b = 2

Simplify further

$\frac{(-3)^3 \times 2^6}{(-3)^5 \times 2^2} = \frac{2^4}{-3^2} = \frac{16}{9}$

Thus,

c = 16

d = 9

Thus values are a = 4, b = 2, c = 16, d = 9

8 0

4 years ago

Question 1 Algebra I will mark as brainlest!!!

soldi70 [24.7K]

Answer:

(x-6)^2 =40

Step-by-step explanation:

The correct answer is (x-6)^2 =40

why??

Expand (x-6)^2

x^2 -12x+36 =40

Transpos 40 to the left side

So,

x^2 -12x+36 -40

Which is

x^2 -12x -4=0

6 0

2 years ago

What is the solution to this equation -8 and one third y equals 2

omeli [17]

I hope this helps you

6 0

3 years ago

Given that 1 gram = 10 decigrams, 1 decigram = 10 centigrams, and 1 centigram = 10 milligrams, how many milligrams equal 15.8 gr

Elina [12.6K]

15800. because if 1 gram is 10 decigrams than 100 centigrams are 1 gram because it's basically multiplying by ten every time you move down in measurement with a gram. I multiplied this number 15.8 by 1000 because 1 gram is 1000 times higher than a milligram.

4 0

3 years ago