MATHEMATICS HIGH SCHOOL

What is the value of x if 3ax - 4x equals 15a -20?

Answers

Answer 1
Answer:

Step-by-step explanation:

3ax - 4x = 15a - 20

x(3a - 4) = 15a - 20

so,

x × 3a = 15a

x × 3 = 15

x = 15/3 = 5

x × -4 = -20

x = -20/-4 = 5

since both terms have the same solution, it is the solution for the whole equation :

x = 5

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A large giraffe eats 34 kilograms of leaves and twigs each day. How many kilograms of leaves and twigs would 17 large giraffes eat in a day?

A.
2 kilograms

B.
51 kilograms

C.
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D.
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Answers

D. 578 kilograms All you have to do is multiply 34*17, which equals 578.

The running time for movie A is 33 mins more than twice the running time for movie B. If the running time for movie A is subtracted from triple the running time for movie B, the result is 57 mins. find the running time for each movie..Movie A-
Movie B-

Answers

X is the running time for movie A and y the running time for movie B
X = 2y + 33
3y - × = 57
x- 2y = 33
-× + 3y = 57  => y = 90
=> x 33 + 180 = 213
use what they tell you to create the equations 

 a=33+2b  & 57=3b-a

for this to work we need to substitute a variable to get rid of it. 
look at 
          57=3b-a (lets switch it around s that the equation reads "a=")
          57+a=3b
          a=3b-57 (this is our new equations)

so now we know that 
a=33+2b & a=3b-57
so we can write 33+2b=3b-57. we have now "gotten rid" of "a"

SOLVE FOR B 

33+2b=3b-57  (get variable alone)
33= 3b-2b-57  (subtract and add accordingly)
33= b-57
33+57=b
90=b     (this means that movie b is 90 long)

SOLVE FOR A

you can plug "b" into any of the original equations.

a=33+2b 
a=33+2(90)
a=33+180
a=213

CHECK

plug "a" into any of the original equations to find "b" if b=90 then you know you've done it right 

213=33+2b
213-33=2b
180=2b
180/2=b
90=b

hope this helps :)

A horizontal demand curve is more elastic than a vertical demand curve.A. True
B. False

Answers

the answer is false my friend.... false
false.
 the answer is false

Need help on m number 2 please

Answers

so the qustion is which of these shos the commutative property
the commutative property of multiplication is
note:ab=a times b=a(b)

so a(bc)=(ab)c

first choice: 4.1 times (6.2 times 5.0)=(4.1 times 6.2) times 5.0
this is obviously the right answer A is the answer

B
2.7 times 1=2.7 this is the identity property of multiplicaiton, anything times 1= same thing


C 7.2 times 0=0 this is the 0 property of multiplication

D. 8.5 times 0.4=0.4 times 8.5
this is the equality property

the answer is A

Justine filled quart jars with 248 pints of juice. How many quart jars did Justine need?

Answers

1 pint is the same as half a quart. This means she will fit 2 pints in every jar. 248/2=124. She needs 124 jars.

Which of the following is not a layer of the Earth? a Inner core b Other core c Mantle d Crust

Answers

Answer:

all of them are the layer of earth

Step-by-step explanation:

if it is about spelling its b, because there is no "other core" instead there is outer core
Other core is not one, if you mean outer core then all of them are layers
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