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2 years ago

Express in scientific notation. Make sure your answer has the same number of significant figures as the starting value.

Mathematics

1 answer:

Elenna [48]2 years ago

7 0

Answer:

1.325 x 10 -2

Step-by-step explanation:

That is the answer and I know 100% that it is correct

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. The volume of a box is 405 cubic units. The length is x units, the width 4 units greater than the length, and the height is 9

lukranit [14]

Answer:

length = 5

width = 9

Step-by-step explanation:

V = lwh

let 'x' = length

let '4+x' = width

9 = height

405 = 9x(4+x)

405 = 36x + 9x²

this is a quadratic equation: 9x² + 36x - 405 = 0

factor out a 9 to get:

9(x² + 4x - 45) = 0

9(x-5)(x+9) = 0

one root is 5 and the other is -9

since distance cannot be negative we use 5 as the length and 9 is the width

3 0

2 years ago

Please help will give brainliest

Ksju [112]

Answer:

a² = 144

b² = 25

c² = 169

c = 13

Step-by-step explanation:

• a² = 12×12

= 144

• b² = 5×5

= 25

• a² + b² = c²

= 144 + 25 = 169

• c = _/169

= 13

6 0

2 years ago

Cotθ= tan30° find theta

scoundrel [369]

Answer:

Step-by-step explanation:

Cot is the same as 1/tan so:

$1/tan(theta) = tan(30)$

By rearranging the equation, we get:

$1/tan(30) = tan(theta)$

By taking the inverse tan, we get:

$theta = tan^-1 (1/tan(30)) =60$

7 0

2 years ago

4. At a school fair, 30% of the pies sold had cheese filling, 25% had beef filling and the remaining 90 pies had potato filling.

astra-53 [7]

Answer:

Step-by-step explanation:

a) Percentage of potato filling = 100 - (30 + 25) = 100 - 55 = 45 %

b) Let the number of pies sold = x

45% of x = 90

$\dfrac{45}{100}*x=90\\\\\\x=90*\dfrac{100}{45}\\\\\\x=2*100\\$

Number of pies = 200

c) Number of cheese filling = 30% of 200

$=\dfrac{30}{100}*200\\\\= 30*2\\\\\\= 60$

Number of beef pies = 25% of 200

$=\dfrac{25}{100}*200\\\\\\=25*2\\\\= 50$

Difference = 60 - 50 = 10

There are 10 more cheese pies than beef pies.

6 0

2 years ago

Will give brainliest! Help me solve this logs problem!! Thank you

Anon25 [30]

Answer:

Step-by-step explanation:

solving equation 1

log125 base 5√5=x
[5√5=√(25×5)=√125]
log125 base 125=x
[From one of the principles of logarithm " logA base a =1]
therefore, log125 base 125=1
x=1

solving equation 2

log 64 base 2√2=y
[2√2=√(4×2)=√8]
log 64 base√8=y
64=(√8)^y
64=8^(½y)
8²=8^(½y)
(8 cancels in both equations and I evaluate the powers figures)
2=½y
y=2×2=4

the product of x and y=x•y=1×4=4

4 0

2 years ago