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3 years ago

Allen bought a computer that was 25% off the regular price of $480.

Mathematics

1 answer:

Ilia_Sergeevich [38]3 years ago

4 0

Answer:

144? or 126 sorry

Step-by-step explanation:

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Solve the system of equations: y= 3x y= x^2 - 4

OLga [1]

Answer:

$x=-1\\y=-3\\\\x=4\\y=12$

Step-by-step explanation:

Make both equations equal to each other and solve for the variable x:

$y=y\\3x=x^2-4\\x^2-3x-4=0\\$

Find two numbers that when you add them you get -3 and the product of both numbers be -4. These numbers are 1 and -4. Then:

$(x+1)(x-4)=0\\\\x+1=0\\x=-1\\\\x-4=0\\x=4$

Substitute these values into one the original equations and solve for y:

$y=3(-1)\\y=-3\\\\y=3(4)\\y=12$

Therefore, you get that:

$x=-1\\y=-3\\\\x=4\\y=12$

5 0

3 years ago

Which expressions are equivalent to 4d+6+2d4d+6+2d ? Choose all answers that apply: Choose all answers that apply: (Choice A) A

Sliva [168]

Answer:

Options A and C are correct choices.

Step-by-step explanation:

We have been given an expression $4d+6+2d$ and we are asked to choose all the equivalent expressions from given choices.

Let us simplify our given expression.

$4d+6+2d=(4d+2d)+6$

$4d+6+2d=6d+6$

Let us see which of our given choices matches with our answer.

A. $2(3d+3)$

Upon using distributive property $a(b+c)=a*b+a*c$ we will get,

$2*3d+2*3$

$6d+6$

Therefore, option A is a correct choice.

B. $6(d+6)$

Upon using distributive property $a(b+c)=a*b+a*c$ we will get,

$6*d+6*6$

$6d+36$

Since this expression is not equivalent to our answer, therefore, option B is not a correct choice.

C. $(3d+3)+(3d+3)$

Upon removing parenthesis we will get,

$3d+3+3d+3$

Upon combining like terms we will get,

$(3d+3d)+(3+3)$

$6d+6$

Therefore, option C is the correct choice.

7 0

3 years ago

Clive has a phone plan where he pays double his base per minute rate for any additional minute spent on a call over twenty minut

Sidana [21]

The two variables that we should use are:

x = number of minutes that the call lasted.
y = cost of that call.

<h3>What variables should we use?</h3>

Here we want to study a relation between the cost per call as the function of the minutes that the call lasted.

So, we need to use two variables, x will be the number of minutes that call lasted, this is the independent variable.

And the variable that depends on that should be the cost of the call, let's say, y is the cost of the call.

These are the two variables that we need to model the situation:

y = f(x)

There says:

<em>"The cost of the call is a </em><em>function </em><em>of the number of minutes that the call lasted".</em>

<em />

If you want to learn more about functions, you can read:

<em>brainly.com/question/4025726</em>

6 0

2 years ago

Find the solution of each equation if the replacement sets are a= { 4,5,6,7,8 } and b= { 9,10,11, 12,13 }.

irga5000 [103]

The answer is 8 so the answer is in set a

4 0

3 years ago

In a class with 28 students, there are 19 boys. What is the ratio of girls to boys? 9:19 19:28 19:9 28:9

leva [86]

Answer:

9:19

Step-by-step explanation:

Total number of students = 28

Number of boys = 19

Number of girls = Total number of students - Number of boys = 28-19 = 9

Therefore, ratio of girls to boys = Number of girls/Number of boys = 9/19 = 9:19

5 0

3 years ago

Read 2 more answers