3 years ago

Ai chỉ cách làm cho mk vs ạ

Mathematics

1 answer:

ozzi3 years ago

7 0

I don’t understand sorry

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What is the positive solution to this equation? 4x^2+ 12x = 135 Record your answer and fill in the bubbles on your answer docume

Ira Lisetskai [31]

Answer:

$\frac{9}{2} or 4.5$

Step-by-step explanation:

4x^2+ 12x = 135

D=b²−4ac=122−4(4)(−135)=144+2160=2304=48²

$x_{p}= \frac{-12+48}{8} =\frac{36}{8}=\frac{9}{2}=4.5$

7 0

3 years ago

Help me pleaseeeeeeeeeeeeee

gregori [183]

Answer:x=1 y=2

Step-by-step explanation:

you add and get 8x=8 x=1 so plugging in one you get 5+2y=9 so 4=2y so y=2

5 0

3 years ago

Read 2 more answers

The sum of eight times a number and three is fifty-nine. Find the number.

jarptica [38.1K]

Answer:

x=7

Step-by-step explanation:

8x +3 = 59

8x= 56

x = 7

6 0

3 years ago

Now i have a second question for brainlest

babunello [35]

Answer:

3 Pounds for 15.10

Step-by-step explanation:

find a common multiplier (12)

4 pounds ($21.50) [×3] 12 pounds ($64.50)

3 pounds ($15.50) [×4] 12 pounds ($ 62)

you save $2.50

4 0

3 years ago

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A company finds it can produce 15 heaters for $ 4050â€‹, while producing 25 heaters costs $ 6550. Express theâ€‹ cost, y, as a l

amid [387]

Answer:

y=250x+300

Step-by-step explanation:

Let x be the number of heaters and y be the total cost.

We need to find the linear function for y in terms of x.

It is given that company can produce 15 heaters for $4050 and 25 heaters costs $ 6550.

It means the line passes through the points (15,4050) and (25,6550).

If a line passes through two points $(x_1,y_1)$ and $(x_2,y_2)$ , then the equation of line is

$y-y_1=\frac{y_2-y_1}{x_2-x_1}(x-x_1)$

The equation of line is

$y-4050=\frac{6550-4050}{25-15}(x-15)$

$y-4050=\frac{2500}{10}(x-15)$

$y-4050=250(x-15)$

$y-4050=250x-3750$

Add 4050 on both sides.

$y-4050+4050=250x-3750+4050$

$y=250x+300$

Therefore, the required linear function is y=250x+300.

8 0

3 years ago