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3 years ago

Fide f (-7) evaluate the function

Mathematics

1 answer:

ikadub [295]3 years ago

6 0

<h3>Solution:</h3>

$f(x) = 4 {x}^{2} - 4x \\ = > f( - 7) = 4( - 7)^{2} - 4( - 7) \\ = 4(49) + 28 \\ = 196 + 28 \\ = 224$

<h3>Answer:</h3>

The answer is 224.

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4.5 divided by 0.9 in written form

Colt1911 [192]

4.5 divided by 0.9.......move the decimal to the left one space because u dont want the divisor to have a decimal...but if u move it over for the divisor, u have to move it over for the dividend...turning ur problem to :45 divided by 9, which equals 5

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4 years ago

Read 2 more answers

James was trying to sleep one night but there was too much noise around him. His clock ticked every

g100num [7]

Answer:

It will occur zero times between midnight and one o'clock.

Step-by-step explanation:

Least Common Multiple (LCM)

Three events keep James from sleeping: his clock ticking every 20 seconds, a tap dripping every 15 seconds, and his dog snoring every 27 seconds.

All three events happened together at midnight. They will happen together again the first time the numbers 20, 15, and 27 have a common multiple. This is the LCM.

List the prime factors of each number:

20: 2,2,5

15: 3,5

27: 3,3,3

Now multiply all the factors the maximum number of times they appear:

LCM=2*2*3*3*3*5=540

(a) All the events will happen together again after 540 minutes.

(b) Since 540 minutes = 9 hours, this event won't happen again until 9 am. Thus, it will occur zero times between midnight and one o'clock.

4 0

3 years ago

I don't know how to this

Brrunno [24]

Answer:

I'm not exactly sure, but I'm gonna say a reflection across line y = x because if you draw a diagonal line between the y and the x axis going through the top right and bottom left quadrants, it would be a reflection across that line.

pls vote brainliest

6 0

3 years ago

A jeweler had a fixed amount of gold to make bracelets and necklaces. The amount of gold in each bracelet is 6 grams and the amo

blagie [28]

Number of bracelets made is 4 and number of necklace made is 8

Solution:

Let "b" be the number of bracelets made

Let "n" be the number of necklace made

amount of gold in 1 bracelet = 6 grams

amount of gold in 1 necklace = 18 grams

Given that he made 4 more necklaces than bracelets

number of necklace made = 4 + number of bracelets made

n = 4 + b -------- eqn 1

The jeweler used 168 grams of gold

Therefore, we can frame a equation as:

number of bracelets made x amount of gold in 1 bracelet + number of necklace made x amount of gold in 1 necklace = 168

$b \times 6 + n \times 18 = 168$

6b + 18n = 168 ---------- eqn 2

Let us solve eqn 1 and eqn 2

Substitute eqn 1 in eqn 2

6b + 18(4 + b) = 168

6b + 72 + 18b = 168

24b = 168 - 72

24b = 96

b = 4

From eqn 1,

n = 4 + b

n = 4 + 4

n = 8

Thus number of bracelets made is 4 and number of necklace made is 8

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3 years ago

An observer from the top of a lighthouse 370 feet above sea level sees two sailboats in the water. The angles of depression to t

noname [10]

Answer:the sailboats are 358 feet apart.

Step-by-step explanation:

The diagram of the triangle representing the situation is shown in the attached photo.

B represents the position of the lighthouse.

D represents the position of the first sailboat.

C represents the position of the second sailboat.

x represents the distance between the two sailboats

We would apply trigonometric ratio

Tan # = opposite/adjacent

For triangle ABD,

Tan 12 = 370/AD

AD = 370/Tan 12 = 370/0.2126 = 1740.357 feet

For triangle ABC,

Tan 10 = 370/AC

AD = 370/Tan 10 = 370/0.1763 = 2098.695 feet

x = AC - AD = 2098.695 - 1740.357 = 358 feet

5 0

3 years ago