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Kay [80]
3 years ago
9

Find the value of x.

Mathematics
2 answers:
Amanda [17]3 years ago
5 0
7/x = 2/4
7x=28
28/7 = 4
x=4
frutty [35]3 years ago
4 0

Answer:

x = 3.5

Step-by-step explanation:

\frac{4}{7} = \frac{2}{x}

4x = 14

x = 3.5

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Evaluate 6j+23+kl−3, when j=3, k=7, and l=33.
Dmitry [639]

Answer:

269

Step-by-step explanation:

6(3)+23+(7)(33)-3

 \/              \/

18 + 23 + 231 - 3 = 269


3 0
2 years ago
What is the y-intercept of the equation y=−5x−2 ? Enter your answer in the box.
tangare [24]

Answer:

(0,-2)

Step-by-step explanation:

substitute in 0 for x

and solve for y

3 0
2 years ago
If you apply ghe change below to the quadratic parent function f(x)=x2 what is the equation of the new function? Shift 1 unit ri
saveliy_v [14]

1 to left gives (x -1)^2

vertical stretch makes it 5(x - 1)^2

reflection in axis changes the sign to - :-

equation of new function is f(x) = -5(x - 1)^2

6 0
3 years ago
If C ( x ) = 11000 + 500 x − 3.6 x 2 + 0.004 x 3 is the cost function and p ( x ) = 1700 − 9 x is the demand function, find the
Bess [88]

Answer:

Step-by-step explanation:

The cost function = C(x)

The demand function = P(x)

C(x) = 11000 + 500x - 3.6x^2 + + 0.004x^3

P(x) = 1700 - 9x

Differentiate C(x) with respect to x

C'(x) = 500 - 7.2x + 0.012x^2

C'(x) is the marginal cost

Revenue = x. P(x)

R(x) = x( 1700 -9x)

= 1700x - 9x^2

Differentiate R(x) with respect to x

R'(x) = 1700 - 18x

R'(x) is the marginal revenue

Profit is maximized when R'(x) = C'(x)

1700 - 18x = 500 - 7.2x + 0.012x^2

Collect like terms

0 = 500 - 1700 - 7.2x +18x +0.012x^2

0 = -1200 + 10.8x +0.012x^2

0 = 0.012x^2 + 10.8x - 1200

Using x=( -b +_ √b^2 - 4ac) /2a

a = 0.012 , b= 10.8 , c= -1200

x= (-10.8 +_ √(10.8^2) - 4*0.012*(-1200)) /2*0.012

= ( -10.8 +_√116.64 + 57.6) / 0.024

= (-10.8 +_ √174.24) / 0.024

= (-10.8 +_13.2) / 0.024

= (-10.8+13.2)/0.024 or (-10.8 - 13.2)/0.024

= 2.4/0.024 or -24/0.024

x= 100 or -1000

Since our profit cannot be negative, the profit = $100

5 0
3 years ago
Please help answer this if your able two :)) ♡
andreev551 [17]
Answer:

Y + 3= 3/4( x - 7)
8 0
3 years ago
Read 2 more answers
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