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Alinara [238K]
2 years ago
8

The substitution property of equality allows you to say that if 7j + 14k = 28 And j = 2 then

Mathematics
2 answers:
natita [175]2 years ago
8 0
K must =1 if j=2 because when substituting in 2 for j you solve for k and get 1

sergey [27]2 years ago
6 0
7 \times (2) + 14k = 2 \\ \\ k = -\frac{7}{6}
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Ms. Banerjee bought a car for $22,500. The amount she paid for her new car was twice the amount she paid for her previous car, w
bagirrra123 [75]

You didn't say if the car bought is the new car or the old car so I'm assuming the car bought for $22,500 is the new car.

You divide 22,500 by 2 to get the cost of the old car. When you do this, you find out the old car costed $11,250.

the equation is 22,500/2=p


If $22,500 is the cost of the old car, then it's not my fault that the poster did not make it clear. If the previous car costed $22,500, then the previous car costed $22,500



8 0
2 years ago
Read 2 more answers
Cos2a.cos3a-cos2a.cos7a/sin4a.sin3a-sin2a.sin5a ​
Dmitrij [34]

Answer is -28.37

Step-by-step explanation:

from the numerator cos 2a×cos 3a - cos 2a×cos7a= cos6a^2 -cos 14a^2

= -cos8a^2 for the numerator

from the denominator;

sin4a×sin3a-sin2a×sin5a= sin12a^2 -sin10a^2

= sin2a^2

therefore, combining the equation it gives; -cos8a^2/sin2a^2

a^2 will divide each other,

= -cos8/sin2.

from the calculator,

= - 0.9903/0.0349

= -28.37

5 0
2 years ago
there is a total of 25 bicycles. if the ratio of gray bicycles to black bicycles is 6 to 9 how many of them are black?
lisov135 [29]
25 bicycles
gray : black
6 : 9 (6+9=15)

25 divided by 15 = 1.666666667
x 9 (that's how many blacks)
= 15
there are 15 blacks
6 0
2 years ago
If the ordinate is three more than twice the abscissa and x {-1, 0, -}, which of the following sets of ordered pairs satisfies t
Greeley [361]
The abscissa is the x-coordinate of the ordered pair and the ordinate is the y-coordinate. The ordered pair is therefore given to be,
   (abscissa, ordinate)
or (x , y)

From the given, it is stated that the ordinate is three more than twice the abscissa. The ordered pair can therefore be written as,
  
  (x, 2x + 3)

If x = -1 then,
  y = 2(-1) + 3 = 1
Ordered pair : (-1, 1)

If x = 0
  y = 2(0) + 3 = 3
Ordered pair : (0, 3)

Hence, the answer to this is either the first choice or the second choice which appears to be just the same. 
7 0
2 years ago
Read 2 more answers
You are out bottle caps, and decide to use Popsicle sticks instead. You measure them, and they are 15.2 cm tall. How many Popsic
satela [25.4K]
It depends on how many Popsicle sticks you are going to use.So, for example, say that you are using 5 Popsicle sticks for the model. What you do is 15.2 x 5, 15.2 being the height of the sticks and 5 for the number of sticks you are using. The answer will be 76 cm tall.           21                                                                                                                     15.2                                                                                                               x    5                                                                                                                ---------                                                                                                             76.0
3 0
2 years ago
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