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3 years ago

A student answers 9 questions

2 answers:

6 0

75%

Explanation:

To find the answer you would divide 9/12 and you get .75, then you move the decimal point to the right twice to get your percentage

brilliants [131]3 years ago

4 0

Answer:

75%

Step-by-step explanation:

$\frac{9}{12}$ = 9 ÷ 12
9 ÷ 12 = 0.75
0.75 × 100 = 75
So, the percent is 75%

I hope this helps!

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using pythagorean inequalities, determine which set of the given three sides produces an acute triangle.

Kruka [31]

To solve this problem, you need to use the Phythagorean theorem c^2 is equal to the sum of a^2 and b^2. If a less than or equal to b and b is less than or equal to c or a^2 plus b^2 is greater than c^2 then it is an acute angle.

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2 years ago

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If a cannonball is shot directly upward with a velocity of 160 ft per second, its height above the ground after t seconds is gi

Contact [7]

Step-by-step explanation:

If a cannonball is shot directly upward with a velocity of 160 ft per second. Its height as a function of time is given by :

$h(t)=160t-16t^2$ .......(1)

t is in seconds

(a) Velocity is given by :

$v=\dfrac{dh}{dt}\\\\v=\dfrac{d(160t-16t^2)}{dt}\\\\v=(160-32t)\ ft/s$

Acceleration is given by :

$a=\dfrac{dv}{dt}\\\\a=\dfrac{d(160-32t)}{dt}\\\\a=-32\ ft/s^2$

(b) For maximum height put $\dfrac{dh}{dt}=0$

i.e.

$160-32t=0\\\\t=5\ s$

Put t = 5 s in equation (1). So,

$h(5)=160t-16t^2\\\\h(5)=160(5)-16(5)^2\\\\h(5)=400\ ft$

h(t) = 0

$160t-16t^2=0\\\\t(160-16t)=0\\\\t=0,t=10\ s$

Hence, this is the required solution.

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3 years ago

Identify the cross section of the solid shown in the image.

jonny [76]

Answer:

Rectangle

Step-by-step explanation:

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3 years ago

Is seven eighths greater than two eights

o-na [289]

It is because there are 7 1/8 and it is bigger than 2 1/8.

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Calculate the width of a 80” TV if the TV has an aspect ratio of 21:9.

blagie [28]

Answer:

34.29 Inch.

Step-by-step explanation:

The Aspect Ratio of a screen is the ratio of the Width to the Height of the screen.

We are told that the TV screen has an aspect ratio of 21:9

Therefore:

$\dfrac{Width}{Height}=\dfrac{21}{9} \\$Since Width =80''\\\dfrac{80}{Height}=\dfrac{21}{9}\\$Cross multiply\\Height*21=80*9\\Height =(80*9) \div 21\\$Height =34.29$

The height of the TV will be approximately 34.29 Inch.

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3 years ago