MATHEMATICS MIDDLE SCHOOL

What is the value of the function when x = 4?

y = 3x + 7

Answers

Answer 1
Answer:

2x - 3y = 7 and -3x + y = 7..multiply Equation 2 by THREE and add to Equation 1
-9x + 3y = 21...........................watch the y's disappear
-7x........ = 28
x = -4
substitute -4 instead of x in either of the ORIGINAL equations

2x - 3y = 7
2(-4) - 3y = 7
-8 -3y = 7..........add 8 to both sides
-3y = 15
y = -5

im not sure
Answer 2
Answer: y=3x+7\ \ \ | substitute\ x=4\n\ny=3*4+7\n\ny=12+7=19\n\nValue\ of\ function\ is\ 19.

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Arif and keisha go to a restaurant fot dinner. their meals total $13.75 and the tax is 5%Question: Arif and keisha want to leave a 15% tip based on the bill and tax combined. how much should they leave? Explain.

Answers

The total cost of the dinner meals taken by Arif and Keisha = $13.75
Percentage of tax that need to be given = 5%
Then
Amount of tax that needs to be given = (5/100) * 13.75 dollars
                                                           = 13.75/20 dollars
                                                           = 0.687 dollars
                                                           = 0.69 dollars
So
The total amount that needs to be
paid for dinner including tax = (13.75 + 0.69) dollars
                                             = 14.44 dollars
Percentage of tips that they both want to leave = 15%
Then
Amount of tips that need to be given = (15/100) * 14.44
                                                           = 216.6/100 dollars
                                                           = 2.17 dollars
So
The total amount that they should leave = (14.44 + 2.17) dollars
                                                                 = 16.61 dollars
So they should leave a total of $16.61 in the restaurant.
    

A bakery bakes 184 loaves of bread in 4 hours. how many loaves does the bakery bake in one hour

Answers

46. Because 184 divided by 4 is 46.
To figure out how many loaves of bread the bakery bakes you simply divide 184 by 4:

184÷4=46
Therefore the bakery bakes 46 loaves of bread per hour 

The set of points P(0, 3), Q(2, 0), R(4, -3) are collinear and the line has a slope of _____.

Answers

Answer:

slope = -1.5

Step-by-step explanation:

A set of three or more points are said to be collinear if they all lie on the same straight line.

We have been given the following collinear set of points;

P(0, 3), Q(2, 0), R(4, -3)

This implies that P, Q, and R lie on the same line.

The slope of a line is defined as; (change in y)/(change in x)

Using the points P and Q, the slope of the line is calculated as;

(0-3)/(2-0) = -3/2 = -1.5

Answer:

-3/2

Step-by-step explanation:

What is 1.64 million rounded to the nearest million

Answers

1.64 million rounded to the nearest million is 2 million.
2 million. Rememer. If you are rounding, if its 5 or more up the score, for or less let it rest. 

0.34+0.1+0.25 use benchmarks to estimate

Answers

Round .34 to .30, .1 to 0, and .25 to .30.
30 + 0 + 30 = 60.

PLEASE HELP! THANKS! The measures, in degrees, of the 3 angles of a triangle are given by 2x +1, 3x - 3, and 9x. What is the measure of the smallest angle? A.) 13 degrees B.) 23 degrees C.) 29 degrees D.) 40 degrees please show how to solve this I GIVE THANKS!!!

Answers

So all of the internal angles of a triangle will add up to 180 degrees.  So if we add all of the expressions given and set them equal to 180, we can solve for x, then solve for each angle...

(2x + 1) + (3x - 3) + 9x = 180
2x + 3x + 9x + 1 - 3 = 180
14x - 2 = 180
14x = 182
x = 13

Now we can substitute 13 into each expression to find the value of each angle...

2x + 1 =
2(13) + 1 =
26 + 1 = 27 degrees

3x - 3 =
3(13) - 3 =
39 - 3 = 36 degrees

9x =
9(13) = 117 degrees

So the 3 angles are 27 degrees, 36 degrees, and 117 degrees.

The smallest is 27 degrees

** Note-- I don't see 27 degrees in the answer choices you gave, so I double checked my math (I didn't find any mistakes).  Please check to see that the question is written correctly (pay close attention to plus and minus signs).
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