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3 years ago

Evaluate the expression when x=1/2 and y=-5 -2xy

Mathematics

2 answers:

Ainat [17]3 years ago

5 0

Answer: Y=-5/2

Step-by-step explanation:

Komok [63]3 years ago

4 0

Answer:

Step-by-step explanation:

=-2 times 1/2 times -5

=-1 times -5 (negative times negative equals positive)

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5.Find the roots of the parabola given by the following equation.

snow_tiger [21]

Answer:

Part 5) The roots are x=-3 and x=1.5

Part 6) The solution on a number line is the shading area below of the line y=-1/3 (close circle)

Step-by-step explanation:

Part 5) Find the roots of the parabola given by the following equation

$2x^{2} +5x-9=2x$

we know that

The formula to solve a quadratic equation of the form $ax^{2} +bx+c=0$ is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$2x^{2}+5x-2x-9=0$

$2x^{2}+3x-9=0$

$a=2\\b=3\\c=-9$

substitute in the formula

$x=\frac{-3(+/-)\sqrt{3^{2}-4(2)(-9)}} {2(2)}$

$x=\frac{-3(+/-)\sqrt{81}} {4}$

$x=\frac{-3(+/-)9} {4}$

$x=\frac{-3(+)9} {4}=1.5$

$x=\frac{-3(-)9} {4}=-3$

therefore

The roots are x=-3 and x=1.5

Part 6) Solve the inequality and graph the solution on a number line.

$-3(5y-4)\geq 17$

Solve for y

$-15y+12\geq 17$

Subtract 12 both sides

$-15y\geq 17-12$

$-15y\geq 5$

Multiply by -1 both sides

$15y\leq -5$

Divide by 15 both sides

$y\leq -1/3$

The solution is the interval -----> (-∞, -1/3]

All real numbers less than or equal to negative one third

The solution on a number line is the shading area below of the line y=-1/3 (close circle)

The graph in the attached figure

7 0

3 years ago

Mrs Tay baked 45 cookies. She gave 5/9 of them to her friends. How many cookies did she give her friends?

DerKrebs [107]

25 cookies. Hope this helps.

4 0

3 years ago

In the middle school coding club, 30% of the members are in 6th grade. If there are 12 sixth graders in the club, how many total

lisov135 [29]

Answer:

40 members

Step-by-step explanation:

Let the total members = x

<u>Given the following data;</u>

Number of sixth graders = 12 members

The mathematical expression is;

$\frac {30}{100} * x = 12$

$0.3x = 12$

$x = \frac {12}{0.3}$

x = 40

<em>Therefore, the total members in the middle school coding club is 40 members</em>.

5 0

3 years ago

An ice cream shoppe makes $15 for every 4 milkshakes they sell. If they made $71.25 and one hour on milkshakes how many did they

lord [1]

Answer:

Step-by-step explanation:

Given that for every 4 milkshakes sold we get $15.

⇒ 1 milkshake cost = 15 ÷ 4 = $3.75

So, if they made $71.25 in one hour then the number of milkshakes sold

= 71.25 ÷ 3.75

= 19

6 0

3 years ago

Read 2 more answers

The GCF of any two even numbers is always even

miv72 [106K]

Interesting
any even number is represented by 2n

so 2 even numbers are
2n ad 2y

any GCF will have that 2 since it is common to both

yes true

3 0

3 years ago