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GrogVix [38]
3 years ago
7

5. Evaluate the function f (x) = 4•7^x for x=-1 and x= 2. Show your work.

Mathematics
2 answers:
mr Goodwill [35]3 years ago
5 0

Answer:

Given

f

(

x

)

=

4

⋅

7

x

For

x

=

−

1

we have

f

(

−

1

)

=

4

⋅

7

−

1

=

4

7

using

a

−

n

=

1

a

n

For x=2, we have

f

(

2

)

=

4

⋅

7

2

=

196

Step-by-step explanation:

masya89 [10]3 years ago
4 0

Answer:

See below

Step-by-step explanation:

f(x) = 4. {7}^{x}  \\  \\ plug \: x =  - 1 \\   \\ f( - 1) = 4. {7}^{ - 1}  \\  \\ f( - 1) =  \frac{4}{7}   \\  \\plug \: x =  2 \\   \\ f( 2) = 4. {7}^{ 2}  \\  \\ f( 2) = 4 \times 49  \\  \\f( 2) = 196  \\  \\

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The perpendicular bisectors of sides AC and BC of △ABC intersect side AB
tiny-mole [99]

The measure of ∠ACB will be 110°

<u><em>Explanation</em></u>

According to the diagram below, DE and DF are the perpendicular bisectors of AC and BC respectively and they intersect side AB at points P and Q respectively.

So, AE=CE and CF= BF

Now, <u>according to the SAS postulate</u>, ΔAPE and ΔCPE are congruent each other. Also, ΔCFQ and ΔBFQ are congruent to each other.

That means, ∠PCE = ∠PAE  and ∠FCQ = ∠FBQ

As ∠CPQ = 78° , so  ∠PCE + ∠PAE = 78°  or,  ∠PCE = \frac{78}{2}= 39°                                    and as ∠CQP = 62° , so ∠FCQ + ∠FBQ = 62° or, ∠FCQ = \frac{62}{2}=31°

Now, in triangle CPQ,  ∠PCQ = 180°-(78° + 62°) = 180° - 140° = 40°

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7 0
3 years ago
The probability of a certain player making a three-point shot is 1/14. What is the probability he does not make his next shot?
kari74 [83]

Answer:

13/14

Step-by-step explanation:

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4 0
4 years ago
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BaLLatris [955]

Answer:

309 feet

Step-by-step explanation:

given that the height can be represented by a quadratic equation, we can say that the general form of the equation will look something like this:

h(x) = Ax² + Bx + C

we know that at the starting point of the launch that time = 0 (i.e x = 0) and hence h (x) = 0, if we substitute this into our equation, we can find the value for C

h(0) = A(0)² + B(0) + C = 0

C = 0

Hence the equation becomes

h(x) = Ax² + Bx

Given when x = 1, h(1) = 121,

121 = A(1)² + B(1)

A + B = 121 ------> eq 1

Given when x = 2, h(2) = 224,

224 = A(2)² + B(2)

4A + 2B = 224 (divide both sides by 2)

2A + B = 112------> eq 2

Solving the system of equations which comprise eq 1 and eq 2 using your favorite method, we end up with A = -9 and B = 130

our equation becomes:

h(x) = -9x² + 130x

when x = 3

h(3) = -9(3)² + 130(3) = 309 feet

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