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3 years ago

NEED HELP ASAP

Mathematics

2 answers:

iragen [17]3 years ago

7 0

Answer:

2.95

Step-by-step explanation:

SCORPION-xisa [38]3 years ago

4 0

Answer:

B 2.95

Step-by-step explanation:

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Evaluate the following expression for x = -1 and y = 2<br> X3-3(x+2y)<br> Please help

zubka84 [21]

x = -1 e y = 2

x = -e y = 2

Figura geométrica

punto

Derivadas parciales

d/dx(2) = 0

d/dy(2) = 0

X3-3(x+2y)

X^3 - 3 (x + 2 y)

Figura geométrica

avión

Forma alternativa

-3 x + X^3 - 6 y

Raíz real

y = 1/6 (X^3 - 3 x)

Raíz

y = 1/6 (X^3 - 3 x)

Discriminante polinómico

Δ_X = -243 (x + 2 y)^2

3 0

3 years ago

Guys please help me with this question

diamong [38]

Answer: Can I get brainliest and 5 stars? thank you.

a) $\frac{65}{99}$

b) $\frac{59}{90}$

c) $\frac{13}{20}$

Step-by-step explanation:

a) $0.65$ I can't put line above it, but the line expresses that 6 and 5 and repeating infinitely. Let X equal the decimal number.

$x=0.65$

First multiply by 1 followed by as many zeros as repeating numbers there are. In this case since 6 and 5 are the repeating numbers, we have to add 2 zeros which is basically multiplying by 100

0.65*100=65.65 (another 65 remains on the right because they're infinite.)

Now substract from the original number. Now we have a new equation that says: $100x=65.65$ .

Substract equation 1 from equation 2.

$100x=65.65\\-x=0.65$

---------------------------------

$99x=65$

Solve just like any other equation. Divide by 99 to isolate x.

$\frac{99x}{99}=\frac{65}{99}$

$x=\frac{65}{99}$ This is the fraction.

------------------------------------------------------------------------------------------------

b) $0.65^-$ This one is a little bit different because we only have 1 repeating number.

In this case we have to multiply by 10.

$0.65^-*10=6.55^-$

Equation 1: $x=0.65^-$

Equation 2: $10x=6.55^-$

Substract.

$10x=6.55^-\\-x=0.65^-$

-----------------------

$9x=5.9$

divide by 9 to isolate x

$\frac{9x}{9}=\frac{5.9}{9}$

$x=\frac{5.9}{9}$

To get rid of the decimal in the numerator, multiply both numerator and denominator by 10 so that we don't change the fraction.

$x=(\frac{5.9*10}{9*10} )$

$x=\frac{59}{90}$ and this is your fraction.

------------------------------------------------------------------------------------------------------

c) 0.65 this one has no repeating number. It's a finite decimal number.

I assume you already know that; $a=\frac{a}{1}$ , so, we can do the same here to have a fraction.

$0.65=\frac{0.65}{1}$

Now, in order to get rid of the decimal, multiply by 1 followed by as many zeros as decimal numbers are. In this case 2 zeros because there are 2 decimal numbers, so it's 100. Remember that if you do it in the numerator, you have to do it in the denominator as well to not change the fraction.

$\frac{0.65*100}{1*100} =\frac{65}{100}$

Simplify if possible.

$\frac{65/5}{100/5} =\frac{13}{20}$ This is your fraction.

6 0

3 years ago

Karla had $138.72 in her checking account. She wrote checks for $45.23 and $18. Then she made a deposit for 75.85 into her accou

vampirchik [111]

Answer:

$151.34

Step-by-step explanation:

First, Karla starts with $138.72.

Then Karla writes checks for $45.23 and $18.00. This means the money will be withdrawn, so let's subtract these from the total.

$138.72 - $45.23 - $18.00 = $75.49

Now, Karla has $75.49 in her account.

However, a $75.85 deposit is made to her account. So let's add this back to the total.

$75.49 + $75.85 = $151.34

So after all the transactions, Karla has $151.34 in her checking account.

5 0

3 years ago

The measures of two angles in this acute triangle are 38° and 72°. What is the measure of the third angle? A. 18° B. 33° C. 70°

Dovator [93]

Answer:

Step-by-step explanation:

38+72= 110

180-110= 70

6 0

3 years ago

Rewrite the equation by completing the square.<br> x2 – 2x + 1 = 0

Nikolay [14]

Answer:

Step-by-step explanation:

3 0

4 years ago