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Phantasy [73]
3 years ago
9

please help with maths !

Mathematics
2 answers:
Margarita [4]3 years ago
8 0

Answer:

use Pythagoras theorem for this question because this is a right angled triangle

Anna11 [10]3 years ago
4 0

Answer:

4.91

Step-by-step explanation:

trying to find adjacent, you know the angle and hypotenuse, so use the CAH equation

cos(51) x 7.8 = 4.91 (3 s.f.)

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Let f(x)=x^3-x-1
alexira [117]
f(x) = x^3 - x - 1

To find the gradient of the tangent, we must first differentiate the function.

f'(x) = \frac{d}{dx}(x^3 - x - 1) = 3x^2 - 1

The gradient at x = 0 is given by evaluating f'(0).

f'(0) = 3(0)^2 - 1 = -1

The derivative of the function at this point is negative, which tells us <em>the function is decreasing at that point</em>.

The tangent to the line is a straight line, so we will have a linear equation of the form y = mx + c. We know the gradient, m, is equal to -1, so

y = -x + c

Now we need to substitute a point on the tangent into this equation to find c. We know a point when x = 0 lies on here. To find the y-coordinate of this point we need to evaluate f(0).

f(0) = (0)^3 - (0) - 1 = -1

So the point (0, -1) lies on the tangent. Substituting into the tangent equation:

y = -x + c \\\\ -1 = -(0) + c \\\\ -1 = c \\\\ \text{Equation of tangent is } \boxed{y = -x - 1}
6 0
3 years ago
Help me with this math question please I'm giving away brainliests ​
Dimas [21]

Answer:

I believe your answer is the second option. My apologies if it is wrong.

Step-by-step explanation:

5 0
3 years ago
after four weeks his balance was to 270 at the end of 13 weeks his balance was $405 how long will it take to reach$540
77julia77 [94]
It will take 22 weeks
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8 0
3 years ago
Read 2 more answers
X to the -12 power=117 in logarithmic form?
mamaluj [8]

Answer:

\log x =\frac{\log 117}{-12} this should be what youre asking

Step-by-step explanation:

  • this is it
  • x^{-12} =117\\ \log x^{-12} =\log 117\\ -12\log x=\log 117\\\log x =\frac{\log 117}{-12}
  • if you want the answer
  • \log x =\frac{\log 117}{-12}\\x =10^{\frac{\log 117}{-12}}\\x=0.6724363439
6 0
2 years ago
Jill and Sonja lived in different towns and decided it would be fun to get a homing pigeon to send messages to each other. (A ho
kramer

Answer:

I would say 5 miles

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
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