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3 years ago

What is the reciprocal of 4.5? And after I get the reciprocal how did they get 2 over 9 for the answer?

1 answer:

3 0

So 4.5 is equal to 4 and 1/2
u can convert that to 9/2
then to get the reciprocal you flip the denominator and numerator
this gives u 2/9

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Use demoivre's theorem to show that; cos4¤ =8 cos4¤ -8cos2¤+1

ss7ja [257]

Answer:

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3 years ago

When solving a quadratic in the form ax2 + bx + c = 0 we are really finding the x–intercepts. These x–intercepts are also called

vlabodo [156]

Answer:

solutions

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2 years ago

helena needs 3.5 cups of flour per loaf of bread and 2.5 cups of flour per batch of muffins. she also needs 0.75 cup of sugar pe

tatuchka [14]

The correct answer is:

She can make 2 loaves of bread and 4 batches of muffins.

Explanation:

Let b represent bread and m represent muffins.

The equation for the amount of flour she needs is 3.5b+2.5m=17.

The equation for the amount of sugar she needs is 0.75b+0.75m=4.5.

To solve this, we will want to eliminate one of the variables. To do this, we will make the coefficients of one of the variables the same. If we multiply 2.5 by 0.3, we get 0.75; this is what we will do to the first equation:

$\left \{ {{0.3(3.5b+2.5m=17)} \atop {0.75b+0.75m=4.5}} \right. \\ \\\left \{ {{1.05b+0.75m=17} \atop {-(0.75b+0.75m=4.5)}} \right. \\ \\0.3b=0.6 \\ \\\frac{0.3b}{0.3}=\frac{0.6}{0.3} \\ \\b=2$

She can bake two loaves of bread.

Substituting 2 for b in the first equation, we have

3.5(2)+2.5m=17

7+2.5m=17

Subtract 7 from each side:

7+2.5m-7=17-7

2.5m=10

Divide both sides by 2.5:

2.5m/2.5 = 10/2.5

m = 4

She can bake 4 batches of muffins.

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4 years ago

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nirvana33 [79]

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3 years ago

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Dvinal [7]

Answer:

A.115 students I think

Step-by-step explanation:

To get from 54 percent to 100 percent, we have to first divide by 54 to get 1 percent and then times 100 to get 100 percent. Since this is an equivalent ratios problem, we do the same thing to the other side, divide 62 by 54 and then times by 100. We should get 114.814815 which we can round up to 115. Hopefully that helps you.

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3 years ago