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yan [13]
3 years ago
13

Help please I feel stupid

Mathematics
1 answer:
deff fn [24]3 years ago
3 0

Answer:

44

Step-by-step explanation:

h(-7) means use the expression labeled h and evaluate it for x=-7.

Like this:

(-7)^2 - 5

49 - 5

44

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Find the number of pairs (a,b) of integers such that<br> a+2/a+5=b/3
Viktor [21]

Answer:

  6

Step-by-step explanation:

The expression can be rearranged to ...

  b = 3 -9/(a+5)

In order for b to be an integer, (a+5) must be an integer divisor of 9. There are exactly 6 of those: ±1, ±3, ±9.

The attached table shows the values (a, b) = (x₁, f(x₁)).

3 0
4 years ago
What are the solutions for x when y is equal to 0 in the quadratic function y=x^2-8x
Elena L [17]
I would use the quadratic formula for this:

  x = -b ± √b² - 4ac over 2a
  x = 8 ± √64 - 4(1)(0) over 2(1)
  x = 8 ± √64 over 2
  x = 8 <span>± 8 over 2 [simplify]
  x = 4 </span><span>± 4
     x1 = 4 + 4    x2 = 4 - 4
     x1 = 8          x2 = 0


Thus, the solutions for x would be 0 and 8.</span>
5 0
3 years ago
If the radius of a circle is 3 meters, how long is the arc subtended by an angle measuring 30°?
FromTheMoon [43]
Circumference of entire circle = 2 * PI * radius
2 * PI * 3 = <span> <span> <span> 18.8</span></span></span>5 meters
a 30 degree arc is (30/360) or 1/12 of a circle.
So the arc equals (18.85 meters / 12) or <span> <span> <span> 1.57</span></span></span> meters.


3 0
3 years ago
Are thes coordinates a function or not? <br><br>(2,2)<br><br>(2,7)<br><br>(-2,9)<br><br>(-4,-5)​
blagie [28]

This is not a function. There are multiple outputs for the same input at x=2. A function only has 1 output for every input.

6 0
3 years ago
Read 2 more answers
What's the length of BD and how?
Advocard [28]
I believe it is 4 or 5
7 0
3 years ago
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