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3 years ago

a student writes "the difference between 15 and the product of 5 and y" to describe the expression 5y-15.Explain the error.

1 answer:

7 0

The word 'difference' indicates the use of subtraction in a Mathematical sum

The error is that the sum could be 15 - 5y instead of 5y - 15

A subtraction sum does not have the commutative properties, meaning that we cannot do the sum in any order.

A sum 15 - 5y will give a different result with the sum 5y - 15 for the same value of y.

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Jerry bought 6.95 pounds of cherry and lime jelly beans dor his birthday party. If 1.75 pounds were cheery, how many pounds were

Gekata [30.6K]

So you have 6.95 pounds and 1.75 pounds of it is cherry.

To find how many pounds you have of lime just subtract the amount of cherry.

6.95-1.75= 5.2 pounds of lime jelly beans

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3 years ago

Y varies inversely as x. If y=5 and x=12, find y if x=4

yan [13]

Answer:

x igual 5 ,12,4

Step-by-step explanation:

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2 years ago

Use the graph to answer the question. Find the slope

Liula [17]

We can take the two points given and plug them into the slope formula.

$\sf~m=\dfrac{y_2-y_1}{x_2-x_1}$

(-3, 3), (1, -5)
x1 y1 x2 y2

$\sf~m=\dfrac{-5-3}{1-(-3)}$

Subtract:

$\sf~m=\dfrac{-8}{4}$

Divide:

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8 0

3 years ago

Please help. I really don't seem to understand this question.

ivann1987 [24]

Answer:

m3=15(8)+22=142

m1=19(8)-10=142

Both are equal so the answer is Yes they are parallel

3 0

2 years ago

2. A lunch stand makes s.75 profit on each chef's salad and $1.20 profit on each Caesar salad. On a typical weekday, it sells be

kow [346]

Let's let

<u>x = the number of chef salads, x>=0</u>

<u>y = the number of Caesar salads, y>=0</u>

The constrains are:

40 <= x <= 60

35 <= y <= 50

x + y <= 100

The objective function here is F(x, y) = 0.75x + 1.20y

The corner points are (40, 35), (60, 35), (60, 40), (50, 50) and (40, 50).

F (40, 35) = 0.75*40 + 1.20*35 = $72

F (60, 35) = 0.70*60 + 1.20*35 = $84

F (60, 40) = 0.75*60 + 1.20*40 = $93

F (50, 50) = 0.75*50 + 1.20*50 = $97.50

F (40, 50) = 0.75*40 + 1.20*50 = $90

Thus, we conclude to maximize the profit 50 Chef and 50 Caesar salads should be prepared.

8 0

3 years ago