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amid [387]
4 years ago
13

A jar contains many coins. The probability that a coin randomly selected from the jar is a penny is 10%. A week later, the proba

bility that a coin randomly selected is a penny is 8%.
Which statement about the jar is true the second time, as compared to a week earlier?

1. The jar has fewer coins in total.
2. The jar has fewer pennies.
3. The jar has more coins, or fewer pennies, or both.
4. The jar has more coins in total.
Mathematics
1 answer:
valkas [14]4 years ago
8 0
4. The Jar Has More Coins. This is because to go from 10% to 8% the number of coins besides penny's has to increase

Please Make Me The Brainlyist!
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Ahmed and Karnia are building scenery of the Egyptian pyramids out of plywood for a community play. They pyramids are represente
Arlecino [84]
A.)
 
The first thing we must do for this case is to find the area of ​​the complete figure.
 We have then:
 Triangle 1:
 A1 = (1/2) * (1.5) * (1)
 A1 = 0.75 feet ^ 2
 Triangle 2:
 A2 = (1/2) * (1.5) * (2)
 A2 = 1.5 feet ^ 2
 Triangle 3:
 A3 = (1/2) * (0.75) * (1)
 A3 = 0.375 feet ^ 2
 Rectangle:
 A4 = (5) * (0.75)
 A4 = 3.75 feet ^ 2
 Adding the areas we have:
 A = A1 + A2 + A3 + A4
 A = 0.75 + 1.5 + 0.375 + 3.75
 A = 6.375 feet ^ 2
 Answer:
 there are 6,375 feet ^ 2 of plywood in the scenery

 B.)
 
Triangles:
 A = A1 + A2 + A3
 A = 0.75 + 1.5 + 0.375
 A = 2,625 feet ^ 2
 Two layers of paint:
 A = 5.25 feet ^ 2 <45 feet ^ 2
 Rectangle:
 A = 3.75 feet ^ 2
 Two layers of paint:
 A = 7.5 feet ^ 2 <45 feet ^ 2
 Answer:
 
One quart of each color is needed.
5 0
4 years ago
Write an equation of a parabola with the given vertex and focus.<br> vertex (-1,3); focus (-1,4)
NeX [460]

See https://web2.0calc.com/questions/i-need-help_4982.

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3 years ago
Solve this trinomial<br> Z^2 + z = -20
Naddik [55]

Answer:

your answer is a complex number making your question wrong

Step-by-step explanation:

First z²+z+20=0, just to make it a quadratic equation, so we can use the quadratric formula:

x=( -b±√b²-4ac)/2a

so to find a b and c we compare

YOUR QUESTION SHOULD BE Z² +Z-20=O.

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what is the rest of your question haha

Step-by-step explanation:

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