Which are sums of perfect cubes? Check all that apply.

Mathematics

1 answer:

vichka [17]4 years ago

5 0

I think these are the sums of perfect cubes.

A = (2x²)³ + (3)³
B = (x³)³ + (1)³
D = (x²)³ + (x)³
E = (3x³)³ + (x^4)³

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In a random sample of 200 college students, 110 were females,125 were under the age of 21 years of age, and 45 males were 21 yea

Liono4ka [1.6K]

Answer: Option 'a' is correct.

Step-by-step explanation:

Since we have given that

Total number of students = 200

Number of females = 110

Number of students under the age of 21 years of age = 125

Number of males under the age of 21 years or older = 45

So, it becomes

Males Females Total

21 years 45 80 125

21 years or older 45 30 75

Total 90 110 200

So, Probability that a female student age 21 or older is selected is given by

$\dfrac{30}{200}=0.15=15\%$

Hence, Option 'a' is correct.

5 0

3 years ago

How do I solve these equations

Sever21 [200]

You need to know the properties of each function.
Tan is opposite (y) over adjacent (x). Sin>0 means that sin is positive, therefore, it is located on either quadrant 1 or 2. Tan=4/3 so it is located in quadrant 1.
The side of the triangle must be Adjacent=3 opposite=4 and hypotenuse=5
Now, you are asked to find the half angle of Cos which is
$\sqrt{\frac{1+cos}{2} }$
By following the formula, cos=3/5 then:
$\sqrt{ \frac{1- \frac{3}{5} }{2} }$ Multiply everything (inside the square $\sqrt{ \frac{5+3}{10} }$ root) by 5
$\frac{2 \sqrt{2} }{ \sqrt{10} }$
$\frac{2 \sqrt{20} }{10}$ Then just simplify
$\frac{ \sqrt{20} }{5}$ The answer is Square root of 20 over 5

3 0

3 years ago

Can someone explain this to me since I don’t get it that well?

Tatiana [17]

so it'd be the first, third and fourth one. all you gotta do is draw a vertical line through the middle of the 1st, 3rd and 4th.

4 0

3 years ago

The solution to -5m = -20 is negative.<br><br> True or false

MrRissso [65]

M=4, false. -5*4=20.

5 0

3 years ago