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3 years ago

Tomorrow than 4 times a number is -18

Mathematics

1 answer:

Law Incorporation [45]3 years ago

7 0

Answer: -5

Step-by-step explanation:

im going to assume tomorrow means Two more.....

$2+4x=-18$

brilliant.

lets do opposite calculations to both sides. what is the opposite of 2? negative 2. so lets subtract 2 from both sides.

we get

$4x=-20$

ok so now we have 4 times x. what is the opposite of this? 4 DIVIDED BY x.

ok now lets do the same to the other side. what is negative 20 divided by 4?

$x=-5$

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What is the exact value of the other root?

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The exact value of the other root to the quadratic equation is $x = -2 - \sqrt 6$

<h3>How to express the solution?</h3>

One of the root is given as:

$x = -2 - \sqrt 6$

As a general rule, the solution to a quadratic equation is represented by:

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This means that the actual root of the given root is:

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3 years ago

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Answer:

(C)Triangle GCH.

Step-by-step explanation:

Given a cube with the top face having points A, B, D, C and the bottom face has points E, F, H, G as shown in the attached diagram.

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3 years ago

Read 2 more answers

A motorboat left a harbor and traveled to an island at an average rate of 13 knots. The average speed on the return trip was 10

vlada-n [284]

Answer:

The distance between harbor & the island D = 72.12 km

Step-by-step explanation:

Let the total distance between harbor & island = D

Motor boat going to the island at speed $S_{1}$ = 13 knots = 24 $\frac{km}{hr}$

Return speed of the motorboat $S_{2}$ = 10 knots = 18.52 $\frac{km}{hr}$

The total time taken for both journey = 6.9 hours

$\frac{D}{S_{1} } + \frac{D}{S_{2} } = 6.9$

$\frac{D}{24} + \frac{D}{18.52} = 6.9$

$D (\frac{1}{24} + \frac{1}{18.52} ) = 6.9$

D ( 0.0956 ) = 6.9

⇒ D = 72.12 km

This is the distance between harbor & the island.

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3 years ago