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3 years ago

Evaluate 13-0.75w+8x when w=12 and x=1/2

Mathematics

1 answer:

podryga [215]3 years ago

3 0

Step-by-step explanation:

13 - 0.75w + 8x

13 - 0.75(12) + 8(.5)

13 - 9 + 4

4 + 4 = 8

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Five times a number is greater then 25

Tems11 [23]

The answer might be 5 times 7 that is 35

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3 years ago

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What is the sum of 20x^2-10x-30

ivann1987 [24]

Answer:

The sum of the roots is 0.5

Step-by-step explanation:

The correct question is

What is the sum of the roots of 20x^2-10x-30

we know that

In a quadratic equation of the form

$ax^{2} +bx+c=0$

The sum of the roots is equal to

$-\frac{b} {a}$

in this problem we have

$20x^{2} -10x-30=0$

$a=20\\b=-10\\c=-30$

substitute

$-\frac{(-10)} {20}=0.5$

Verify

Find the roots of the quadratic equation

The formula to solve a quadratic equation is equal to

$x=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}$

$a=20\\b=-10\\c=-30$

substitute

$x=\frac{-(-10)\pm\sqrt{-10^{2}-4(20)(-30)}} {2(20)}$

$x=\frac{10\pm\sqrt{2,500}} {40}$

$x=\frac{10\pm50} {40}$

$x=\frac{10+50} {40}=1.5$

$x=\frac{10-50} {40}=-1$

The roots are x=-1 and x=1.5

The sum of the roots are

$-1+1.5=0.5$ ----> is ok

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3 years ago

Identify 1 and 2. Select all that apply of the following terms: acute, right, obtuse, adjacent, vertical, complementary, supplem

Fittoniya [83]

∠1 and ∠2 are RIGHT ANGLES, VERTICAL ANGLES, and SUPPLEMENTARY ANGLES.

Hope this helps!

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3 years ago

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A company makes desks, coffee tables, and corner tables. Each item uses units of wood, fabric, and stuffing.

Anastasy [175]

Answer: 50x+30y+5z= 690

40x+15y+5z= 620

45x+10y+5z= 510

Step-by-step explanation: The first equation to find units of wood, the second is for the units of fabric, and the third is for the units of stuffing.

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1 year ago

10-1: Compound Probability

ahrayia [7]

Answer:

Step-by-step explanation:

Probability of black pens = 3/14

Probability of white paper clips = 16/40

to find the probability of black pen and white paper clip we have to multiply these two probability.

3/14 x 16/40 = 48/560 = 8.6

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3 years ago