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3 years ago

Please help me 10 points

Mathematics

1 answer:

mote1985 [20]3 years ago

6 0

1. 4x = 7(x - 3) 1.Given

4x = (7)(x) + (7)(-3)

2. 4x = 7x - 21 2.Distributive property

4x - 7x = 7x - 7x - 21

3. -3x = -21 3.Subtraction property of equality

-3x : (-3) = -21 : (-3)

4. x = 7 4.Division property of equality

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Solve the following for y: 2x + 2y = 8

MrRissso [65]

The Answer to this question is

X+y-4=0

6 0

3 years ago

WILL REWARD!!! HELP

Nana76 [90]

2j+6a = 24

5j+3a =21

multiply the 2nd equation by -2

-10j -6a = -42

add the 1st and the modified 2nd together

2j+6a = 24

-10j -6a = -42

---------------------

-8j = -18

divide by -8

j = 2.25

substitute into

2j+6a = 24

2(2.25) +6a =24

4.50 +6a =24

subtract 4.5 from each side

6a = 19.50

divide by 6

a = 3.25

Answer:

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3 years ago

If 5 students had to share 7 brownies, how much would each student get?

Furkat [3]

It would be 35 because 7x5 equals 35

7 0

3 years ago

If f (x) = 5 x minus 25 and g (x) = one-fifth x + 5, which expression could be used to verify g(x) is the inverse of f(x)?

gayaneshka [121]

Answer:

$f(g(x))=x$

Step-by-step explanation:

Given a certain function $f(x)$ , and then its inverse function $f^{-1}(x)$ , the following expression is valid:

$(f\cdot f^{-1})(x)=x$

where the expression

$(f\cdot f^{-1})(x)=f(f^{-1}(x))$

indicates the composite function.

In this problem, we have:

$f(x)=5x-25$

And then, its inverse function is

$g(x)=\frac{1}{5}x+5$

To verify that g(x) is the inverse of f(x), the following expression must be true:

$f(g(x))=x$

Substituting the expression of g(x) into f(x), we find that:

$f(g(x))=5g(x)-25=5(\frac{1}{5}x+5)-25=x+25-25=x$

So, g(x) is the inverse of f(x).

6 0

3 years ago

Read 2 more answers

If AB = 3, AD= 5, andDE= 6, what is the length of BC?

egoroff_w [7]

Answer:

D. 3.6

Step-by-step explanation:

=> Taking proportionality of the similar sides to find BC

$\frac{AB}{AD}=\frac{BC}{DE}$

$\frac{3}{5} = \frac{BC}{6}$

Multiplying 6 to both sides

$BC = 0.6 * 6$

BC = 3.6

5 0

3 years ago