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2 years ago

8

A ruler costs pence. A pen costs 10 pence more than the ruler. Write an expression, in terms of , for the total cost of 3 pens a

nd 2 rulers.

1 answer:

BabaBlast [244]2 years ago

4 0

Answer:

5 + 30

Step-by-step explanation:

That's the expression in terms of x for the total cost of 3 pens and 2 rulers.

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What is the answer to the equation 4x + - 9 = 74

zzz [600]

Answer:

x = 20.75

Step-by-step explanation:

<u>Step 1: Solve for x</u>

4x + (-9) = 74

4x - 9 + 9 = 74 + 9

4x / 4 = 83 / 4

x = 20.75

Answer: x = 20.75

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3 years ago

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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) - (

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A.

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

$\displaystyle h=\frac{2ab}{a+b}$
$\displaystyle\implies\frac{h-a}{b-h}=\frac{\frac{2ab}{a+b}-a}{b-\frac{2ab}{a+b}}$
$\displaystyle\implies\frac{h-a}{b-h}=\frac{2ab-a(a+b)}{b(a+b)-2ab}$
$\displaystyle\implies\frac{h-a}{b-h}=\frac{ab-a^2}{b^2-ab}$
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The other direction can be proved by following the manipulations in the reverse order.

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2 years ago

Help? unit rates

andreev551 [17]

Answer:

1. You would divide 30 by 3 which would be 10 bags of leaves per hour.

2. You would divide 34 by 17 which would be 2 quizzes per week.

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1) If x= 4.2 and y = 5, what is the value of the expression

____ [38]

Answer:

Step-by-step explanation:

y-x=0.7

y=x+0.7, so lets plug in that into the expressions instead of y

1)

(y-x)=

x+0.7-x=

x+0.7+(-x)=

x+(-x)+0.7=

x-x+0.7=

0.7

2)

(x-(x+0.7))/((x+0.7)-x)=

(x-x+0.7)/(x+0.7-x)=

(x-x+0.7)/(x+0.7+(-x))=

(x-x+0.7)/(x+0.7+(-x))=

(x-x+0.7)/(x+(-x)+0.7)=

(x-x+0.7)/(x-x+0.7)=

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1

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3 years ago

How many meters are there in two and three-quarter kilometres?

SashulF [63]

<span>2 3/4 Kilometers= 2,750 meters.

</span>

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