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ira [324]
3 years ago
13

THE Postage rates for sending parcels were $25 for the first 250g and $3.90 for additional 250g or part of 250g. How much did it

cost to send a parcel weighting 830g?
Mathematics
1 answer:
olga_2 [115]3 years ago
8 0
830

830÷250
= 3.32

It's mean that 250 have 3 times...

Frist 250 = $25
Second 250 = $3.90
Third 250 = $3.90

830-3(250)
= 80

So, we have 80g more

80 = $3.90

Total = 25+3.90+3.90+3.90
= $36.70
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0.2 (20x + 10) = -42
Finger [1]

Answer:

x = -11

Step-by-step explanation:

0.2(20x + 10) = -42

4x + 2 = -42                    Distribute 0.2 to the numbers in the paranthesis

4x = -44                          Add 2 to both sides

x = -11                              Divide 4 from both sides

4 0
3 years ago
Q19. When a resistor is placed across 230M supply (de) the
Vera_Pavlovna [14]

The value of the resistor that must be connected in parallel is 57.47 ohms

<h3>How to determine the resistor connected across the 230 V supply</h3>
  • Voltage (V) = 230 V
  • Current (I) = 12 A
  • Resistor 1 (R₁) =?

V = IR

230 = 12 × R₁

Divide both sides by 12

R₁ = 230 / 12

R₁ = 19.17 ohms

<h3>How to determine the total resistance</h3>
  • Voltage (V) = 230 V
  • Current (I) = 16 A
  • Total resistance (Rₜ) =?

V = IR

230 = 16 × Rₜ

Divide both sides by 12

Rₜ = 230 / 16

Rₜ = 14.375 ohms

<h3>How to determine the resistor connected in paralle</h3>
  • Resistor 1 (R₁) = 19.17 ohms
  • Total resistance (Rₜ) = 14.375 ohms
  • Resistor 2 (R₂) = ?

1/Rₜ = 1/R₁ + 1/R₂

Collect like terms

1/R₂ = 1/Rₜ - 1/R₁

R₂ = (Rₜ × R₁) / (R₁ - Rₜ)

R₂ = (14.375 × 19.17) / (19.17 - 14.375)

R₂ = 57.47 ohms

Learn more about Ohm's law:

brainly.com/question/796939

#SPJ1

6 0
1 year ago
What is the area of the figure?
Effectus [21]

Answer:

0.77 M

Step-by-step explanation:

I'm going to assume this is a half-circle

Formula:

A = (πr^2)/ 2

D = 1.4

r = 0.7

A = (π 0.7^2)/2

A = (0.49π)/2

A = 0.7693

A = 0.77

8 0
2 years ago
give an example of a repeating decimal where two digits repeat. explain why your number is a rational number
Mama L [17]
1.666666, any decimal or number that is repeating can be written in a/b format and b not equal zero is rational. Repeating decimals can be considered rational because they can be represented as a ratio of two integers. 
5 0
3 years ago
Help please thanks multiple choice..........
vlada-n [284]
The answer is 7 fifths
7 0
3 years ago
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