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3 years ago

Evaluate 3(m^2-2) when m=1.5

Mathematics

1 answer:

Nitella [24]3 years ago

7 0

Answer:

0.75

Step-by-step explanation:

Put the number where the variable is and do the arithmetic.

3(1.5² -2) = 3(2.25 -2) = 3(0.25) = 0.75

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PLZ NEED HELP ASAP!!!

madam [21]

Answer:

C and D

Step-by-step explanation:

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3 years ago

Plzz help me to solve this qns please

tatiyna

9514 1404 393

Answer:

₹14000

Step-by-step explanation:

Let c represent the cost price, and m represent the marked price.

c × (1 +40%) = m

m × (1 -15%) - c = ₹1900

Using the first expression for m, the second equation becomes ...

1.40c×0.85 -c = ₹1900

0.19c = ₹1900

c = ₹1900/0.19 = ₹10000

Then the marked price was ...

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The marked price was ₹14000.

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3 years ago

At 3pm, the length of the shadow of a thin vertical pole standing on level ground is the same as the height of the pole. A while

aliya0001 [1]

Answer: The height of the pole is 175.97 ( approx )

Step-by-step explanation:

Let the height of the pole is x cm,

Also, let the angle of elevation of the sun to the pole at 3 pm is $\theta$

Thus, by the question,

$tan\theta = \frac{\text{ The height of the pole}}{\text{ The height of the shadow}}$

$\implies tan\theta = \frac{x}{x}$ ( at 3pm the height of shadow = height of the pole)

$\implies tan\theta = 1$

$\implies \theta = 45^{\circ}$

Again, according to the question,

When the angle of elevation is $(\theta - 12^{\circ})$ ,

The height of shadow = x + 95,

$\implies tan(45-12)^{\circ}=\frac{x}{x+95}$

$\implies tan 33^{\circ}=\frac{x}{x+95}$

$\implies tan 33^{\circ}x + 95\times tan33^{\circ}=x$

$\implies tan 33^{\circ}x - x = - 95\times tan33^{\circ}$

$\implies -0.3505924068 x = - 61.6937213538$

$x=175.969930202\approx 175.97\text{ cm}$

4 0

3 years ago

The sum of two numbers is 150 the ratio of the same number is 3:2 find the bigger number

Paladinen [302]

$3x-\ bigger\ number\\
2x-\ smaller\ number\\\\
3x+2x=150\\\\
5x=150\ \ \ | divide\ by\ 5\\\\
x=30\\\\
3x=3*30=90\\\\ Bigger\ number\ is\ 90.$

5 0

3 years ago

Find the number represented by the prime factorization. 2^2 x 3^2 x 5

ra1l [238]

Answer:4x14

Step-by-step explanation:

4 0

3 years ago

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