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crimeas [40]
3 years ago
13

Using the Quadratic Formula, which of the following is the solution to the quadratic equation x2 - 3x - 28 = 0?

Mathematics
2 answers:
algol133 years ago
8 0

The answer is (x+7)(x-4)

hence, the solution should be C

Vinvika [58]3 years ago
8 0

x = [ -)-3)  +/- sqrt((-3)^2 - 4*1*-28) ] / 2

=  (3 + sqrt 121) / 2   and (3 - sqrt 121) / 2

= 3/2 + 11/2  and 3/2 - 11/

= (1.5 + 5.5)   and 1.5 - 5.5

Answer is 7, -4

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Niki wants to buy a dog bed the cost $87. She earns $6 per week for doing chores. How many weeks will Niki have to do her chores
Viktor [21]

Answer:

The answer to your question is 14.5 weeks

Step-by-step explanation:

Data

Total cost = C = $87

money earned = m = $6

Number of weeks to have the money = w = ?

Process

1.- Write an equation that represents the situation

            Weeks = Total cost / Money earned

             w = C/m

2.- Substitute the values

             w = 87 / 6

3.- Result

             w = 14.5

4.- Conclusion

Niki will last 14.5 weeks to have enough money to buy a dog bed.

7 0
2 years ago
1. Find the value of the expression.<br>6 = 4[3(5 - 8) + 6] + 7​
Art [367]

Answer:

24

Step-by-step explanation:

5 0
3 years ago
Please help me guys like I really need it
Lesechka [4]

Inequality 1: y ≤ 5x + 1

Inequality 2: y > x - 2


#1. The slope is 5, the y-intercept is 1, the shaded area is below the line and the line is solid, which means that y is less than or equal to the equation. (you add the "equal to" because the line is a solid line)

#2. The slope is 1, the y-intercept is -2, the shaded area is above the line and the line is dotted, which means that y is greater than the equation

6 0
2 years ago
(HELP) what is 10 1/2 ÷ 9 2/6 = ? (show ur work)
Readme [11.4K]

Answer:

9/8 or 1.125

Step-by-step explanation:

10 1/2 ÷ 9 2/6

= 21/2 ÷ 56/6

= 9/8

= 1.125

=》 See the attachment.

Hope it helps ⚜

8 0
2 years ago
Read 2 more answers
SOMEONE, PLEASE HELP ME WITH THIS PLSSSS
Stels [109]

Answer:

Step-by-step explanation:

1. You can use the intercepts to graph the line. The graph of 2x + 3y = 12      crosses the x-axis at (6, 0), so its x-intercept is 6. The graph of 2x + 3y = 12  crosses the y-axis at (0, 4), so its y-intercept is 4.

2. Point-Slope Form: y - y1 = m(x - x1)

Standard Form: ax + by = c

5x - 2y = 10

-2y = -5x + 10

y = (5/2)x - 5    The slope is 5/2.

y - 2 = (-5/2)(x - 10)

y = (-5/2)x + 25 + 2

y = (-5/2)x + 27      The slope is -5/2.

y = (-5/2)x - 10     The slope is -5/2.

5 0
2 years ago
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