MATHEMATICS MIDDLE SCHOOL

The length of a rectangle is 5 centimeters less than twice its width. Its area is 42 square centimeters. Find the dimensions of the rectangle.The width is
and the length is

​

Answers

Answer 1
Answer:

Answer:

width=6cm, lenth is 7cm

Step-by-step explanation:

Let width of rectangle be x cm

Twice width=2x cm

length=2x-5 cm

Area of the rectangle= L× W =42cm²

(2x-5) × x =42

x(2x-5)=42

2x²-5x-42=0

solving the quadratic equation

x=6cm

width=6cm

length= (2×6)- 5 =7cm

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Answers

no if it it was 16.450 then it would be equal to 16.45
No, because the values are different by 0.004.
However, 16.454 does round to 16.45 if that is what you mean.

Cheddar cheese costs £7.50 for 1kg.Marie buys 200 grams of cheddar cheese.How much does she pay?(PLEASE SHOW WORKING OUT)

Answers

There are 1000g in a kilogram.
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£7.50÷5=£1.50
The answer is £1.50

Hope this helped.

1Mom buys a rectangular rug with an area of 77 square
meters. The length of the rug is 35 meters. What is the width
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Answers

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6. Describe how you would make 250 mL of a 4.5 M silver nitrate solution. SHOW ALL CALCS.

Answers

Answer:

Dissolve 190 grams of silver nitrate in 250 mL of water.

Step-by-step explanation:

First, find the moles of AgNO₃ from the volume and concentration.

0.250 L × 4.5 mol/L = 1.125 mol

Next, find the mass of AgNO₃ using the molar mass.

1.125 mol × 170 g/mol = 191.25 g

Rounded to two significant figures, dissolve 190 grams of silver nitrate in 250 mL of water.

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Answers

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