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saw5 [17]
3 years ago
6

Evaluate the expression when a=

Mathematics
1 answer:
Olin [163]3 years ago
3 0

Answer:

\frac{2}{15}

Step-by-step explanation:

Substitute the values for a and c into the expression

- 2c + a

= - 2× \frac{3}{10} + \frac{11}{15}

= - \frac{3}{5} + \frac{11}{15}

= - \frac{3(3)}{5(3)} + \frac{11}{15}

= - \frac{9}{15} + \frac{11}{15}

= \frac{2}{15}

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Answer:

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Step-by-step explanation:

Let the price of a single cupcake be x.

We know that there are 4 cupcakes in a box, so 4x is equal to the price of 4 cupcakes and hence the price of a box.

The question tells us that a box costs at most $20, so we can write this as an inequality:

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x is less than or equal to 5, which can be interpreted as a cupcake costing at most $5.

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the angle c is 90°, it is a right triangle. (you see from the picture).

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so

180 - 90 - 29 =

61° (angle A)

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90 + 61 + 29 = 180°


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