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marishachu [46]
2 years ago
14

Translate the sentence into an inequality. Nine times b is at least - 18.

Mathematics
1 answer:
nirvana33 [79]2 years ago
6 0

Answer:

9b≥ -18

Step-by-step explanation:

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A high street store advertises 35% reduction on all clothing items. A dress costs £85 before the reduction. How much does it cos
Temka [501]

Answer:

£55.25

Step-by-step explanation:

Cost after reduction

=Cost before sale - Reduction in cost

= 85 - 35% of 85

= 85 - 0.35*85

= 85 - 29.75

= £55.25

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2 years ago
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How to find minimum and maximum of this equation.
Westkost [7]

Using it's vertex, the maximum value of the quadratic function is -3.19.

<h3>What is the vertex of a quadratic equation?</h3>

A quadratic equation is modeled by:

y = ax^2 + bx + c

The vertex is given by:

(x_v, y_v)

In which:

  • x_v = -\frac{b}{2a}
  • y_v = -\frac{b^2 - 4ac}{4a}

Considering the coefficient a, we have that:

  • If a < 0, the vertex is a maximum point.
  • If a > 0, the vertex is a minimum point.

In this problem, the equation is:

y + 4 = -x² + 1.8x

In standard format:

y = -x² + 1.8x - 4.

The coefficients are a = -1 < 0, b = 1.8, c = -4, hence the maximum value is:

y_v = -\frac{1.8^2 - 4(-1)(-4)}{4(-1)} = -3.19

More can be learned about the vertex of a quadratic function at brainly.com/question/24737967

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2 years ago
Which expression is equivalent to 11c-4c? A. 5c+2c B. 3c+7c
timurjin [86]
11c-4c = 7c
5c+2c= 7c
3c+7c= 10c

11c-4c= 5c+2c =A
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3 years ago
What is the mathematical sentence of "A number increasd by 7 is 15?
svet-max [94.6K]

Answer:

B

Step-by-step explanation:

A number increased by 7 means, 7 was added to the number and the result is 15

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