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Dvinal [7]
3 years ago
7

Please Help

Mathematics
1 answer:
o-na [289]3 years ago
8 0

Answer:

23

Step-by-step explanation:

-The length of the cubes side is (x-5) and the total surface area is 1944 sq units.

-We apply the formula for surface area and equate to solve for x:

A=6s^2\\\\1944=6(x-5)^2\\\\324=(x-5)^2\\\\324=x^2-10x+25

#Equate to zero as below:

324=x^2-10x+25\\\\x^2-10x+25-324=0\\\\x^2-10x-299=0\\\\\# Quadratic \ Formula:\\\\x_{1,2}=\frac{-b\pm \sqrt{b^2-4ac}}{2a}\\\\\\=\frac{10\pm\sqrt{(-10)^2-4(1\times-299)}}{2\times1}\\\\x_1=23, \ \ \ x_2=-13

length dimensions are always positive.

Hence, the value of x is 23

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Answer:

t = 5 seconds

Step-by-step explanation:

It is given that, the height h, in feet of a ball above the ground is given by :

h=-16t^2+64t+80

Where t is in seconds

We need to find how long does it take the ball to hit the ground? When it hits the ground, its height will be equal to 0. So,

-16t^2+64t+80=0\\\\t=\dfrac{-64\pm \sqrt{(64)^2-4\times (-16)(80)} }{2\times -16}\\\\t=\dfrac{-64+ \sqrt{(64)^2-4\times (-16)(80)} }{2\times -16},\dfrac{-64-\sqrt{(64)^2-4\times (-16)(80)} }{2\times -16}\\\\t=-1\ s\ \text{and}\ t=5\ s

Neglecting negative time.

It means ball will take 5 seconds to hit the ground.

3 0
3 years ago
X + 3.6 = -7.3<br> X =<br> help ASAP
dolphi86 [110]

Answer: -10.9

Step-by-step explanation:

-3.6 on both sides to get rid of the 3.6, the x= -10.9

8 0
3 years ago
A sack of potatoes weighs 14 pounds 9 ounces after wendy makes potato salad for a picnic the sack weights 9 pounds 14 ounces wha
dlinn [17]
For this case we have the following conversion:
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 Then we rewrite the sack weights:
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 Then, we subtract both values:
 (14 9/16) - (9 7/8) = 4.6875 = 4 + 0.6875
 Rewriting:
 4 + 0.6875 = 4 + 6875/1000
 4 + 1375/200 = 4 + 275/40
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 Answer:
 
the weight of the potatoes wendy use for the potato salad is:
 
4 + 55/8 pounds
5 0
4 years ago
WILL GIVE BRAINLEST<br> Slove f(9) if f(x)= -6x - 1<br> Show Step-by-Step pls.
Inga [223]

Answer:

-37

Step-by-step explanation:

f(9)= -6X9-1

= -36-1

= -37

4 0
3 years ago
Read 2 more answers
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