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2 years ago

Wind forms dunes through ___.

Mathematics

1 answer:

Leto [7]2 years ago

7 0

Answer: I think it would have to be c) Sublimation

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Angela practiced piano for 2 1/2 hours on friday, 2 1/3 hours on saturday, and 3 2/3 hours on sunday. how much time did angela p

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2 1/3 + 3 2/3 = 6 hours total practiced

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3 years ago

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3x-9=-21 equation in words

sergeinik [125]

'nine less than three times a number is negative twenty-one.'

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3 years ago

Sure face of a prism

vladimir2022 [97]

Answer:

Step-by-step explanation:

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3 years ago

A change jar contains nickels, dimes and quarters. The total amount of money in the jar is $1.90. The amount of nickels is one m

telo118 [61]

Answer:

Number of dimes = 3

Number of nickels = 7

Number of quarters = 5

Step-by-step explanation:

Let x be the number of dimes in the jar.

The amount of nickels is one more than twice the number of dimes, then the amount of nickels is $2x+1.$

The number of quarters is one half the total number of nickels and dimes, so the number of quarters is $\frac{1}{2}(x+2x+1)=\frac{1}{2}(3x+1)$

Fill in the table

$\begin{array}{ccc}&\text{Number of coins}&\text{Value in these coins in cents}\\ \\\text{Dimes}&x&10x\\\text{Nickels}&2x+1&5(2x+1)\\\text{Quarters}&\frac{1}{2}(3x+1)&25\cdot \frac{1}{2}(3x+1)\end{array}$

Thus, the total sum in cents is

$10x+5(2x+1)+\dfrac{25}{2}(3x+1)\\ \\=10x+10x+5+\dfrac{75}{2}x+\dfrac{25}{2}\\ \\=20x+37.5x+5+12.5\\ \\=57.5x+17.5$

The total amount of money in the jar is $1.90 that is 190 cents. So,

$57.5x+17.5=190\\ \\575x+175=1,900\ [\text{Multiplied by 10}]\\ \\575x=1,900-175\\ \\575x=1,725\\ \\x=3$

Number of dimes = 3

Number of nickels = 7

Number of quarters = 5

Check the total amount of money in the jar:

$3\cdot 10+7\cdot 5+5\cdot 25=30+35+125=190\ cents =\$1.90$

4 0

3 years ago

Andrew had a collection of 300 baseball cards at the beginning of the summer After the summer Andrew had traded some of his base

Norma-Jean [14]

Answer:

The percentage decrease is 29%

Step-by-step explanation:

Given

$Initial = 300$

$Final = 213$

Required

Determine the percentage decrease

This is calculated as thus:

$\%Percentage = \frac{|Final - Initial |}{Initial} * 100\%$

Substitute values for Final and Initial

$\%Percentage = \frac{|213 - 300|}{300} * 100\%$

$\%Percentage = \frac{|-87|}{300} * 100\%$

Get absolute value of -87

$\%Percentage = \frac{87}{300} * 100\%$

$\%Percentage = \frac{87* 100\%}{300}$

$\%Percentage = \frac{8700\%}{300}$

$\%Percentage = 29\%$

Hence, the percentage decrease is 29%

6 0

3 years ago