All categories

3 years ago

When x = 3 and y = 5, what is the value of 3x2 - 2y?

Mathematics

2 answers:

Vanyuwa [196]3 years ago

6 0

Answer: 8

Hope this helps :)

Mumz [18]3 years ago

4 0

Answer:

Step-by-step explanation:

3 times 3 is 9

2 yimes 5 is 10

9 times 2 is 18

18-10 is 8

You might be interested in

Factorise the expression fully; 72ab-36bc+48bd

Serggg [28]

72ab-36bc+48bd

Factor out 12b from the expression

12b x(6a-3c+4d)

Answer : 12b x(6a-3c+4d)

4 0

3 years ago

WILL GIVE BRAINLIEST. Billy ordered a pizza with a crust that is 10π inches long. What is the area of the pizza?

Allisa [31]

Answer:

~31.42

Step-by-step explanation:

I multiplied 10 x pi and it gave me 31.4159265359 and I rounded up to 31.42

3 0

3 years ago

Randall bought 2 game controllers at Electronics Plus for $36. What is the unit rate for a game controller at Electronics Plus

yKpoI14uk [10]

Would it be half of 36

4 0

3 years ago

Read 2 more answers

Hi, teacher I was absent these days and I didn’t understand anything about this lesson and I need help this is not count as a te

motikmotik

Given:

There are given that the cos function:

$cos210^{\circ}=-\frac{\sqrt{3}}{2}$

Explanation:

To find the value, first, we need to use the half-angle formula:

So,

From the half-angle formula:

$cos(\frac{\theta}{2})=\pm\sqrt{\frac{1+cos\theta}{2}}$

Then,

Since 105 degrees is the 2nd quadrant so cosine is negative

Then,

By the formula:

$\begin{gathered} cos(105^{\circ})=cos(\frac{210^{\circ}}{2}) \\ =-\sqrt{\frac{1+cos(210)}{2}} \end{gathered}$

Then,

Put the value of cos210 degrees into the above function:

So,

$\begin{gathered} cos(105^{\circ})=-\sqrt{\frac{1+cos(210)}{2}} \\ cos(105^{\operatorname{\circ}})=-\sqrt{\frac{1-\frac{\sqrt{3}}{2}}{2}} \\ cos(105^{\circ})=-\sqrt{\frac{2-\sqrt{3}}{4}} \\ cos(105^{\circ})=-\frac{\sqrt{2-\sqrt{3}}}{2} \end{gathered}$

Final answer:

Hence, the value of the cos(105) is shown below:

$cos(105^{\operatorname{\circ}})=-\frac{\sqrt{2-\sqrt{3}}}{2}$

4 0

1 year ago

The current in a simple electric circuit varies inversely as the resistance. If the current is 20amps when the resistance is 5 o

IrinaVladis [17]

Answer:

0.5amps

Step-by-step explanation:

I is inversely proportional to resistance

I = k/R

k = I/ R

k = 20/5

k = 4

This means that, I = 4/R

So, when R = 8ohms,

I = 4/8

=0.5amps

3 0

3 years ago

When x = 3 and y = 5, what is the value of 3x2 - 2y?​

When x = 3 and y = 5, what is the value of 3x2 - 2y?