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3 years ago

An iphone costs $1000 and is on sale for 20% off

Mathematics

2 answers:

-Dominant- [34]3 years ago

7 0

It’s 800 in total for a phone off 20%. 20% of 1000 is 200, so you do 1000-800 to get your final answer

vfiekz [6]3 years ago

6 0

Answer:

200

Step-by-step explanation:

20 X 1000= 20000 divided by 100

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A disco ball is shaped like a sphere with a diameter of 16 inches to the nearest square inch what is the surface area of the dis

stepladder [879]

The surface area of a sphere:
A = 4 pi r^2
where pi = 3.1416
r is the radius

since diameter is given
r = d / 2
r = 16 / 2
r = 8

A = 4 pi (8^2)
A = 804 sq in is the surface area of the disco ball

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3 years ago

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If a= 2ft and c= 11ft. Find the missing side of the right triangle

dlinn [17]

Answer:

$\sqrt{117}$ or $3\sqrt{13}$

Step-by-step explanation:

The formula for finding the any side of the triangle is

$a^{2}+b^{2} =c^{2}$

We know that a=2 and c=11, so we can go ahead and plug those into the formula.

$2^{2}+b^{2} =11^{2}$

$4+b^{2} =121$

To find side b, we have to make it alone on one side. Subtract 4 on both side.

$b^{2} =117$

Now square root both sides, and that leaves us with:

$b=\sqrt{117}$ or $3\sqrt{13}$

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3 years ago

In January, the depth of a lakeksas 1,053 feet. In August, the depth of the lake was 737.1 feet. What is the percentage decrease

GuDViN [60]

Answer:

Your answer would be B. $30$ %

Step-by-step explanation:

To figure out the decrease, you would first subtract the two numbers.

$1053 - 737.1 = 315.9$

Next, you would multiply the number by $1053$ .

$\frac{315.9}{1053} = .3$

Then, you would multiply that by $100$ .

$.3 * 100 = 30$

The answer would be $30$ %.

$1053 * .3 = 315.9$

$1053-315.9 = 737.1$

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3 years ago

Someone please help me with this ASAP

makkiz [27]

Answer:

y=-4x-1

Step-by-step explanation:

y=mx+b

m is the slope

b is the y-intercept

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3 years ago

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If you pick a card at random from a well shuffled deck, what is the probability that you get a spade or a king

Goryan [66]

The probability of getting a spade is 1/4, and the probability of getting a king is 1/13. Thus, the probability of getting a spade or a king is $\frac{1}{4} + \frac{1}{13} = \boxed{\frac{17}{52}}$ .

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3 years ago

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