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labwork [276]
3 years ago
13

Eric sold cell phones for 70 dollars Eric increases his sale price by 100% what is the sales price of the cell phone

Mathematics
1 answer:
Stella [2.4K]3 years ago
7 0
Current Price = $70

Percentage increase = 100% of $70 = $70

Sale Price = $70 + $70 = $140

------------------------------------------------------------------------
Answer: The sale price of the cell phone is $140.
------------------------------------------------------------------------
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ale4655 [162]

Answer:

x=25

Step-by-step explanation:

The total angles of a triangle is 180°

So 180=36+61+(4x-17)

83=(4x-17)

100=4x

x=25

5 0
2 years ago
A balloon is rising at a constant speed of 5 ftys. A boy is cycling along a straight road at a speed of 15 ftys. When he passes
Ket [755]

Answer:

  13 ft/s

Step-by-step explanation:

t seconds after the boy passes under the balloon the distance between them is ...

  d = √((15t)² +(45+5t)²) = √(250t² +450t +2025)

The rate of change of d with respect to t is ...

  dd/dt = (500t +450)/(2√(250t² +450t +2025)) = (50t +45)/√(10t² +18t +81)

At t=3, this derivative evaluates to ...

  dd/dt = (50·3 +45)/√(90+54+81) = 195/15 = 13

The distance between the boy and the balloon is increasing at the rate of 13 ft per second.

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The boy is moving horizontally at 15 ft/s, so his position relative to the spot under the balloon is 15t feet after t seconds.

The balloon starts at 45 feet above the boy and is moving upward at 5 ft/s, so its vertical distance from the spot under the balloon is 45+5t feet after t seconds.

The straight-line distance between the boy and the balloon is found as the hypotenuse of a right triangle with legs 15t and (45+5t). Using the Pythagorean theorem, that distance is ...

  d = √((15t)² + (45+5t)²)

7 0
2 years ago
Write the standard form of the equation of each line.<br><br> 1. y= -2/5x+1<br> 2. y+3 = -3/2(x+1)
gavmur [86]

Answer:

1. 2x + 5y = 5

2. 3x + 2y = -9

Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
Change 3/8 in to decimal show working​
mixas84 [53]

Answer:

0.375

Step-by-step explanation:

Convert the fraction to a decimal by dividing the numerator by the denominator.

3/8 = 0.375

7 0
2 years ago
The product of two factors is 7,200.if one of the factors is 90,what is the other factor?
Eddi Din [679]

Ok. Something times 90 = 7200.


Let something = x


90x = 7200


Divide both sides by 90.


90x/90 = 7200/90


x = 80


The other factor is 80.


5 0
3 years ago
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