3 years ago

I need help with this please help me

Mathematics

2 answers:

Tatiana [17]3 years ago

8 0

Answer:last one

Step-by-step explanation:

german3 years ago

5 0

Answer:

39 inches

Step-by-step explanation:

n/a

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D=h+9 The variable H represents the number of hours worked, and the variable d represents the amount of dough prepared how many

Marta_Voda [28]

Answer:

12 hours

Step-by-step explanation:

If we assume that the units of D are kg, then we can put the given number into the equation and solve.

21 = h +9

12 = h . . . . . subtract 9

Eli worked 12 hours to prepare 21 kg of dough.

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3 years ago

Identify the variation as direct, inverse, joint or combined.

Inessa [10]

<span>a. direct variation
A relationship between two variables in which one is a constant multiple of the other. </span>

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Harmonic mean if a number h such that (h-a)/(b-h)=a/b Prove h is H(a,b) iff satisfies either relation a. (1/a)-(1/h) = (1/h) - (

Fudgin [204]

A.

$\displaystyle\frac1a-\frac1h=\frac1h-\frac1b$
$\implies\displaystyle\frac{h-a}{ah}=\frac{b-h}{bh}$
$\implies\displaystyle\frac{h-a}{b-h}=\frac{ah}{bh}$
$\implies\displaystyle\frac{h-a}{b-h}=\frac ab$

b.

$\displaystyle h=\frac{2ab}{a+b}$
$\displaystyle\implies\frac{h-a}{b-h}=\frac{\frac{2ab}{a+b}-a}{b-\frac{2ab}{a+b}}$
$\displaystyle\implies\frac{h-a}{b-h}=\frac{2ab-a(a+b)}{b(a+b)-2ab}$
$\displaystyle\implies\frac{h-a}{b-h}=\frac{ab-a^2}{b^2-ab}$
$\displaystyle\implies\frac{h-a}{b-h}=\frac{a(b-a)}{b(b-a)}$
$\displaystyle\implies\frac{h-a}{b-h}=\frac ab$

The other direction can be proved by following the manipulations in the reverse order.

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3 years ago

Y=3x+4 and crosses through the point (1,8)

erma4kov [3.2K]

The answer is your equation does not pass though the point (1,8)

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3 years ago

Help me please!!!!!!!!!!!!!!!

shutvik [7]

Answer:

12 20 15

Step-by-step explanation:

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3 years ago

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I need help with this please help me ​

I need help with this please help me