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svlad2 [7]
2 years ago
11

F (x) = x^2 + 4x; Find f (−7)

Mathematics
1 answer:
elena-14-01-66 [18.8K]2 years ago
4 0

Answer:

f(-7) = 21

General Formulas and Concepts:

<u>Pre-Alg</u>

  • Order of Operations: BPEMDAS

Step-by-step explanation:

<u>Step 1: Define</u>

f(x) = x² + 4x

f(-7) is x = -7

<u>Step 2: Solve</u>

  1. Substitute:                    f(-7) = (-7)² + 4(-7)
  2. Evaluate:                       f(-7) = 49 + 4(-7)
  3. Multiply:                        f(-7) = 49 - 28
  4. Subtract:                       f(-7) = 21
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In a vending machine, there were 27 coins, all dimes and quarters. The total value of the money was $5.10.
amm1812

Answer:

11 dimes and 16 quarters

Step-by-step explanation:

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5 0
3 years ago
Pam and Chris found a home for which they would have to borrow H dollars. If they take out a 25-year loan with monthly payment M
Mariana [72]
The amount of money borrowed is $ H
Time for borrowing is 25 years
Amount paid per month M
Amount paid per year 12M
Interest rate paid=I
Let the payment method be simple interest method, then:
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plugging in our values we have:
I=(H×R×M)/100
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3 years ago
The locations, given in polar coordinates, for two ships are (8 mi, 63º) and (8 mi, 123º). Find the distance between the two shi
Anna35 [415]
We know that

The arrangement forms an isosceles triangle with equal legs of 8 miles.
The angle between the legs is equal to

123-63=60°

 Therefore, the other two angles are
Angles = (180-60)/2 = 120/2 = 60°
It can, therefore, be noted that all angles are equal and thus the resulting triangle is actually an equilateral triangle and thus all the sides are equal.

Hence
the answer is
the distance between the two ships is 8 miles apart

alternative Method
Applying the law of cosines
<span>c²=a²+b²-2*a*b*cos C
</span>where
a=8 miles
b=8 miles
C is the angle between the legs-------> 123-63------> 60 degrees
c is the distance between the two ships
so
c²=8²+8²-2*8*8*cos 60------> c²=64-------> c=√64------> c=8 miles


5 0
3 years ago
Read 2 more answers
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Answer:

x=4. Verified, Not wrong.

Step-by-step explanation:

24=9x+4-4x

24 = 5x+4

20-4

5x=20

(divide)

x=4

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2 years ago
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Hey mate l think it is 

<span>23.040 cubic units </span>
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3 years ago
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