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igomit [66]
3 years ago
11

Shelley's pet food store sold one customer 5 peanut butter biscuits for $3. She sold another customer 7 beef treats for $4.20. W

rite a proportion that compares the sales of these two items, and find the cross products. The cross products are both equal to
Mathematics
3 answers:
arsen [322]3 years ago
7 0

Given that,

Shelley's pet food store sold one customer 5 peanut butter biscuits for $3. She sold another customer 7 beef treats for $4.20.

For peanut, the cost is ratio is

\dfrac{5}{3}

For beef, the ratio is

\dfrac{7}{4.2}

If we take cross product of these items,

\dfrac{5}{3}=\dfrac{7}{4.2}\\\\5\times 4.2=3\times 7\\\\21=21

It implies, that the sale is in true proportion. From the cross product, we find that it is equal.

DaniilM [7]3 years ago
4 0

Answer:

Hello!!! erz here ^^

Step-by-step explanation:

21!

Hope this helps!! :D

Lina_smartkid2 years ago
0 0

21 I took the test!

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A=8, b=5, C=90 degree; Find c, A, and B<br><br> This is for the law of sine and cosine
brilliants [131]

Answer:

• c = √89 ≈ 9.434

• A = arcsin(8/√89) ≈ 57.995°

• B = arcsin(5/√89) ≈ 32.005°

Step-by-step explanation:

By the law of cosines, ...

c² = a² + b² -2ab·cos(C)

Since c=90°, cos(C) = 0 and this reduces to the Pythagorean theorem for this right triangle.

c = √(8² +5²) = √89 ≈ 9.434

Then by the law of sines (or the definition of the sine of an angle), ...

sin(A) = a/c·sin(C) = a/c = 8/√89

A = arcsin(8/√89) ≈ 57.995°

sin(B) = b/c·sin(C) = b/c = 5/√89

B = arcsin(5/√89) ≈ 32.005°

6 0
3 years ago
Is a positive integer raised to a negative power always positive
Evgesh-ka [11]

Answer:

Yes

Step-by-step explanation:

Many students gets confused with these exponential problems, they often get misguided but understand that there is nothing to be confused of.

When you have a negative number, you just take the reciprocal of the whole exponent number.

What is a reciprocal?

Let's take an integer for example, let's take the number 3.

The reciprocal for 3 is (1/3)

Let's take an other number, let's take 2/3

The reciprocal for 2/3 is (3/2)

In conclusion, we just reverse the denominator and the numerator or just switch it.

We take 3 as (3/1) and that is the reason, the reciprocal would be (1/3)

Now, coming to the negative integers. Taking an example:

(2)⁻¹

This would be become (1/2¹) = (1/2)

Hence, the result of a negative integer is positive but would be a fraction.

Hope I helped!


3 0
3 years ago
Sales at a grocery store increase 22% during the month of December. If the monthly sales are $300,000, how much are the sales in
dybincka [34]
300000 + 300000×0.22 = $366000
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3 years ago
Brad biked 1 4/6 miles on Monday, 1 3/6 miles on Tuesday, 1 5/6 miles on Wednesday, &amp; 1 2/6 miles on Thursday. Which day did
snow_tiger [21]
He biked 1 5/6 miles on Wednesdays which is more than the others. The order for the most to least would be as follows....

Wednesday: 1 5/6 miles

Monday: 1 4/6 miles (this can be simplified to 1 2/3)

Tuesday: 1 3/6 miles( this can be simplified to 1 1/2)

Thursday: 1 2/6 miles (this can be simplified to 1 1/3)
3 0
3 years ago
Read 2 more answers
Let A and B be nxn matrices such that AB is singular prove that either A or Bis singular
Alex_Xolod [135]
\det(\mathbf{AB})=\det\mathbf A\times\det\mathbf B

Because \mathbf{AB} is singular, we have

\det(\mathbf{AB})=0

from which it follows that either \det\mathbf A=0 or \det\mathbf B=0.
4 0
3 years ago
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