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Makovka662 [10]
3 years ago
7

I WILL GIVE BRAINLY IF 2 PEOPLE ANSWER! I spent 3/4 of my money and then I spent 1/5 of what was left.

Mathematics
2 answers:
harina [27]3 years ago
6 0

Answer:

0.55

Step-by-step explanation:

Advocard [28]3 years ago
3 0

Answer:

1/20 or 0.05

Step-by-step explanation:

Make common denominators

3/4 --Multiply by 5/5--> 15/20

1/5 --Multiply by 4/4--> 4/20

Then apply to the problem

3/4 spent means 1/4 left

15/20 ---> 5/20 left

Then they spend 1/5 (4/20) of what they have left

(5/20) x (4/20) = 20/400

Simplify

1/20 or 0.05

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At the start of 2014, lucy's house was worth £200 000.
kobusy [5.1K]

Answer:

£230,000

Step-by-step explanation:

5 percent of £200,000 is £10,000 (200,000*0.05)

3 years have passed from 2014 to 2017

3 * 10,000 = 30,000

£200,000 + £30,000 = £230,000

7 0
3 years ago
What are the solutions of the equation 9x4 – 2x2 – 7 = 0? Use u substitution to solve. tions of the equation 9
skelet666 [1.2K]

Answer:

Step-by-step explanation:

Let u^2=x^4\\u = x^2

Subbing in:

9u^2-2u-7=0

a = 9, b = -2, c = -7

The product of a and c is the aboslute value of -63, so a*c = 63.  We need 2 factors of 63 that will add to give us -2.  The factors of 63 are {1, 63}, (3, 21}, {7, 9}.  It looks like the combination of -9 and +7 will work because -9 + 7 = -2.  Plug in accordingly:

9u^2-9u+7u-7=0

Group together in groups of 2:

(9u^2-9u)+(7u-7)=0

Now factor out what's common within each set of parenthesis:

9u(u-1)+7(u-1)=0

We know this combination "works" because the terms inside the parenthesis are identical.  We can now factor those out and what's left goes together in another set of parenthesis:

(u-1)(9u+7)=0

Remember that u=x^2

so we sub back in and continue to factor.  This was originally a fourth degree polynomial; that means we have 4 solutions.

(x^2-1)(9x^2+7)=0

The first two solutions are found withing the first set of parenthesis and the second two are found in other set of parenthesis.  Factoring (x^2-1) gives us that x = 1 and -1.  The other set is a bit more tricky.  If

9x^2+7=0 then

9x^2=-7 and

x^2=-\frac{7}{9}

You cannot take the square root of a negative number without allowing for the imaginary component, i, so we do that:

x=±\sqrt{-\frac{7}{9} }

which will simplify down to

x=±\frac{\sqrt{7} }{3}i

Those are the 4 solutions to the quartic equation.

5 0
3 years ago
HELP!! I NEED THIS QUICKLY
Elza [17]

Answer:

A and D

Step-by-step explanation:

We are given that

(3/4,2/3),(1/4,1),(1,1/2) and (1/2,1)

x_1=\frac{3}{4}

y_1=\frac{2}{3}

x_2=\frac{1}{4},y_2=1

x_3=1,y_3=\frac{1}{2}

x_4=\frac{1}{2},y_4=1

k=\frac{1}{2}

Direct proportion:

\frac{x}{y}=k

Inverse proportion:xy=k

\frac{x_1}{y_1}=\frac{3}{4}\times \frac{3}{2}=\frac{9}{8}\neq \frac{1}{2}

Therefore, it is not in direct proportion.

\frac{1}{4\times 2}=\frac{1}{8}\neq\frac{1}{2}

\frac{1}{\frac{1}{2}}=2\neq \frac{1}{2}

x_1y_1=\frac{3}{4}\times \frac{2}{3}=\frac{1}{2}

x_2y_2=\frac{1}{4}\times 2=\frac{1}{2}

x_3y_3=1\times \frac{1}{2}=\frac{1}{2}

x_4y_4=\frac{1}{2}\times 1=\frac{1}{2}

Therefore, xy=k=\frac{1}{2}

Hence, the given points form an inverse variation .

xy=\frac{1}{2}

y=\frac{1}{2x}

Option A and D is true.

6 0
3 years ago
The integers -5 and 5 are called?
Ierofanga [76]
Additive Inverse. -5 and 5 are opposites.
4 0
3 years ago
Please help i dont want to fail please help me i beg of you..
daser333 [38]

Answer:

the answer is

- 3 \frac{1}{4}

Step-by-step explanation:

But for the number line go by the -3 then to 1/4 on the -3rd line hope this helps!

8 0
3 years ago
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