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Mars2501 [29]
3 years ago
11

Find the value of f(7) for the function f(x) = -3x + 6

Mathematics
1 answer:
Vaselesa [24]3 years ago
4 0

Answer:

D. -15

Step-by-step explanation:

f(x)=7

f(x) = -3x + 6

Then substitute x for 7 and solve linearly.

-3(7)+6

-21+6

=-15

The answer is D

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AfilCa [17]
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x pencils = ? . one hour = 60 minutes

14 * 60 = 80/3 * x       /*3
14 * 60 * 3 = 80 * x
80 * x = 2520            /80
x = 2520 / 80
x = 31.5 pencils

The result would be 32 pencils in one hour.
5 0
3 years ago
Jade read 24 pages of her book on Sunday and 16 pages on Tuesday. If her book is 82 pages long, how many more pages does she nee
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she needs to read 42 more pages

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82-40=42

7 0
3 years ago
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three friends earned more then $200 washing cars. they paid their parents $28 for supplies and divides the rest of money equally
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X is each friend
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3 years ago
Find the constant of proportionality
kirill115 [55]

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Step-by-step explanation:

8 0
3 years ago
The vertices of a triangle are (-1,3) (6,3) and (-1,-4)
Travka [436]

Answer:

24.5 unit²

Step-by-step explanation:

Area of ∆

= ½ | x₁(y₂ - y₃) + x₂(y₃ - y₁) + x₃(y₁ - y₂) |

= ½ | (-1)(3 -(-4)) + 6(-4 -3) + (-1)(3 - 3) |

= ½ | -7 - 42 |

= ½ | - 49 |

= ½ (49)

= 24.5 unit²

<u>Method 2:</u>

Let the vertices are A, B and C. Using distance formula:

AB = √(-1-6)² + (3-3)² = 7

BC = √(-6-1)² + (-4-3)² = 7√2

AC = √(-1-(-1))² + (4-(-3))² = 7

Semi-perimeter = (7+7+7√2)/2

= (14+7√2)/2

Using herons formula:

Area = √s(s - a)(s - b)(s - c)

here,

s = semi-perimeter = (14 + 7√2)/2

s - a = S - AB = (14+7√2)/2 - 7 = (7 + √2)/2

s - b = (14+7√2)/2 - 7√2 = (14 - 7√2)/2

s - c = (14+7√2)/2 - 7 = (7 + √2)/2

Hence, on solving for area using herons formula, area = 49/2 = 24.5 unit²

3 0
2 years ago
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