16x²-81=0 solve the following quadratic equation

Answers

Answer 1

Answer: $16x^2-81=0\n\n(4x)^2-9^2=0\n\n(4x-9)(4x+9)=0\iff4x-9=0\ \vee\ 4x+9=0\n\n4x=9\ \vee\ 4x=-9\n\nx=(9)/(4)\ \vee\ x=-(9)/(4)$

$or\n\n16x^2-81=0\n\n16x^2=81\ \ \ \ /:16\n\nx^2=(81)/(16)\n\nx=\pm\sqrt(81)/(16)\n\nx=-(√(81))/(√(16))\ \vee\ x=(√(81))/(√(16))\n\nx=-(9)/(4)\ \vee\ x=(9)/(4)$

Answer 2

Answer: 16x^2-81=0
(4x-9)(4x+9)
x=9/4 or x=-9/4

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Find the sum of 130 cm. And 50 mm.in meters

Answers

The sum of 130 cm and 50 mm. in meters is 1.35 m.

What is the unitary method?

The unitarymethod is a method for solving a problem by the first value of a single unit and then finding the value by multiplying the single value. The unitary method is a method by which we find the value of a single unit from the value of multiple devices and the value of more than one unit from the value of a single unit.

We are given the sum of 130 cm and 50 mm. in meters

130 cm = 130 / 100

= 1,3m

50 mm = 50 / 1000

= 0,05m

Therefore, the addition is;

1.3 + 0.05m = 1.35m

Learn more about the unitary method, please visit the link given below;

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130 cm = 130 / 100 = 1,3m
50 mm = 50 / 1000 = 0,05m
1,3 + 0,05m = 1,35m

Simplify the expression
9 + 10h + -5h = 0

Please show steps

Answers

9 + 10h + -5h=0
19 + -5 =0
14=0

Concrete is a mixture of cement, sand, and gravel. The Masons will purchase a cement, sand, and gravel mixture in a ratio of 1:2:3. How many pounds of each material are needed for 60 lb of concrete mix?

Answers

10 pounds of cement, 20 pounds of sand, 30 pounds of gravel. 10:20:30 = 1:2:3
10 + 20 + 30 = 60

1 1/10% as a fraction

Answers

1 and 1/10% as fraction
first convert to improper
1 and 1/10=11/10
percent means parts out of 100
11/10%=(11/10)/100

times the whole thing by 10/10 to clear fraction (since 11/10 times 10=110/10=11)

(11/10)/100 times 10/10=11/1000

How do you solve 39= 1 3/10b

Answers

$39=1(3)/(10)b\n----------------------\n1(3)/(10)=(1*10+3)/(10)=(13)/(10)\n----------------------\n(13)/(10)b=39\ \ \ \ |divide\ both\ sides\ by\ (13)/(10)=multiply\ boths\ sides\ by\ (10)/(13)\n\nb=39*(10)/(13)\n\nb=3*10\n\n\boxed{b=30}$

What is the value of the expression 7–3? A. –21 B. Negative Exponents C. Negative Exponents D. 343

Answers

its not A (7-3=4 4 doesn't = -21) and it's not D (7-3=4 4 doesn't = 343)
and B & C is the same thing

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