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postnew [5]
3 years ago
8

Which pair of ratios forms a proportion?

Mathematics
1 answer:
tatiyna3 years ago
5 0
B )5 15 ;9 27 its proportion
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Expand the following (4/5d - 7e)2
tensa zangetsu [6.8K]

Answer: \dfrac{16d^2}{25}+49e^2-\dfrac{56de}{5}

Step-by-step explanation:

Given

The expression is

(\dfrac{4d}{5}-7e)^2

Use identity (a-b)^2=a^2+b^2-2ab

Apply identity

\Rightarrow \left( \dfrac{4d}{5}-7e\right)^2=\left( \dfrac{4d}{5}\right)^2+(7e)^2-2\times \left( \dfrac{4d}{5}\right)(7e)\\\\\Rightarrow \left( \dfrac{4d}{5}-7e\right)^2=\dfrac{16d^2}{25}+49e^2-\dfrac{56de}{5}

4 0
3 years ago
A grocery store sells almonds for $7/1b and peanuts for $5/lb. Let x represent the number of pounds of almonds, and let y
jenyasd209 [6]

Answer:

7x+ 5y <= 10

Step-by-step explanation:

As the x represents the number of pounds of almonds and the price of the almonds is $7/lb, we need to look for an inequality where the x is multiplied by $7 and the same with the y and $5.

It's useless to multiply the x by $5 or the y by $7 because we are mixing the prices of the nuts.

On the other hand, we don't want to spend more than 10. That means we can spend 10 or less.

Therefore, the inequality we can use to find how much of each type of nut we can buy without spending more than $10 is

7x+ 5y <= 10

6 0
3 years ago
Help this is my exit ticket HURRY LOTS OF POINTS
lisov135 [29]

Answer:

The answer for this question ( ur exit ticket ) is C .

6 0
3 years ago
Read 2 more answers
Your friend deposits $2000 in an investment account that earns 3.3% annual interest. Find the balance after 5 years when the int
UkoKoshka [18]

Answer:

8,323.15918

Step-by-step explanation:

pretty much $2000 times 1.33 then the sum times 1.33 and repeat the process for every year

7 0
3 years ago
If b=6, what is 12b​
SOVA2 [1]

Answer:

72

Step-by-step explanation:

12b

Let b = 6

12*6

72

8 0
3 years ago
Read 2 more answers
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