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Rainbow [258]
3 years ago
14

Which of the following could be the graph of the equation y = -2x? * please answer

Mathematics
1 answer:
mihalych1998 [28]3 years ago
6 0
B.

The line starts at the origin and goes down by two.
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Which expression fits this description?
madam [21]

Answer:

The expression that fits the description is ;

(8a + b)/4

Step-by-step explanation:

Here, we want to find the expression that fits the given description;

We are told that the expression is a sum of two terms

The first term is 2 * a = 2a

The second term is the quotient ( result of division) of b and 4 = b/4

So the term we are looking for is;

2a + b/4 = (8a + b)/4

6 0
3 years ago
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Prove: If a^2-a is even then a is even.
Alla [95]

This is not always true. Consider a=3. Then 3^2-3=9-3=6 is even, but a is odd.

6 0
3 years ago
A school bought pens, each costing $1, and pencils, each costing $0.5. The cost of the whole purchase was $220. How many pens an
Levart [38]

Answer:

200 pencils and 120 pens

Step-by-step explanation:

Let the number of pencils be x while pens be y.

Considering the cost of whole purchase then, we get the equation

0.5x+y=220

Considering the number of items bought, then the equation is

x-y=80

Adding the two equations then we have

1.5x=300

x=300/1.5=200

Consideeing that x-y=80 and x is 200 then

200-y=80

y=200-80=120

Therefore, the pencils were 200 and pens 120 pieces

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3 years ago
traveled Downstream a distance of 33 Mi and then came right back. If the speed of the current was 12mph and the total trip took
spayn [35]
<span>Traveled Downstream a distance of 33 Mi and then came right back. If the speed of the current was 12 mph and the total trip took 3 hours and 40 minutes.
Let S = boat speed in still water then                                                                         (s + 12) = downstream speed                                                                                  (s -12) =  upstream speed 
     Given Time = 3 hours 40 minutes = 220 minutes   = (220/60) h = (11/3) h                      Time = Distance/Speed
                  33/(s +12) + 33/(s-12) = 11/3                                                                               3{33(s-12) + 33(s +12)} = 11(s+12) (s -12)                                                          99(s -12 + s + 12) = 11(</span> s^{2} + 12 s -12 s -144)                                                   99(2 s) = 11(s^{2} -144)                                                                                        198 s/11 = (s^{2} -144)                                                                                         18 s = (s^{2} -144)                                                                                            (s^{2} - 18 s - 144) = 0                                                                                         s^{2} - 24 s + 6 s -144 =0                                                                                       s(s- 24) + 6(s -24) =0                                                                                            (s -24) (s + 6) = 0                                                                                                  s -24 = 0, s + 6 =0                                                                                                s = 24, s = -6                                                                     Answer) s = 24 mph is the average speed of the boat relative to the water.  
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3 years ago
Draw two lines that are perpendicular. What type of angle is formed where the perpendicular lines intersect?
Vladimir79 [104]

a right angle (90 degrees)

4 0
3 years ago
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