3 years ago

1) Find 0.2+(-0.6). » Model the expression on the number line

Mathematics

1 answer:

Temka [501]3 years ago

5 0

Answer:

-0.4

Step-by-step explanation:

If using a number line, start at 0.2 and go backwards 0.6 to get to -0.4

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Help please this math is hard just number 3 the one that has no writing

Colt1911 [192]

You actually have most of the answers correct.
E is the origin
D is the x axis
A is the y axis
B is at coordinates (1, 3)
C is at coordinates (3, 1)
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3 years ago

20x^2-30=4x solve for x

ankoles [38]

Answer:

x=1.3288 or -1.1288

Step-by-step explanation:

Given $20x^{2}-30=4x$

Subtract 4x from both sides

$20x^{2}-4x-30=0$

Since we can factor out 2 from whole equation, let's factor out 2.

$2(10x^{2}-2x-15)=0$

Divide with 2 on both sides

$10x^{2}-2x-15=0$

We got the quadratic equation, we can solve for x using quadratic formula.

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

$x=\frac{2\pm\sqrt{2^{2}-4X10X(-15)} } {2X10}$

$x=\frac{2\pm\sqrt{604} }{20}$

$x=\frac{2\pm2\sqrt{151}}{20}$

$x=1.3288or-1.1288$

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6.3 + |8.7 + (-6.8)|

igor_vitrenko [27]

Answer:

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Step-by-step explanation:

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Which equation applies the associative property of multiplication? (−14−53)−35=−14−(53−35) (−78⋅25)+(−78⋅35)=−78⋅(25+35)

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