3 years ago

Combine the like terms to create an equivalent expression:-5r+8r+5

Mathematics

1 answer:

Olegator [25]3 years ago

3 0

Answer : 3r+5 hope this helps!

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saw5 [17]

Answer:

The answer is sin-1(5/8)

Step-by-step explanation:

I don't have a calculator but just plug that in in degree mode.

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3 years ago

4(1-x) + 2x = -3( x + 1)

vlada-n [284]

Answer:

x = -7

Solution:

4(1-x) + 2x = -3( x + 1)

4(1 - x) + 2x = -3 (x + 1)

4(-x + 1) + 2x = -3 (x + 1)

-4x - 4 + 2x = -3(x + 1)

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2 years ago

Find the discriminant and determine the nature of the roots to the quadratic equation

Katen [24]

№17
$x^{2} +6x-7=0 \\ D=6 ^{2} -4*(-7)=36+28=64=8 ^{2} \\ \\ x_{1} = \frac{-6+8}{2} =1 \\ \\ x_{2} = \frac{-6-8}{2} =-7$
Answer: x₁ = 1
   x₂ = - 7

№18
$2 x^{2} -3x+4=3 \\ 2 x^{2} -3x+4-3=0 \\ 2 x^{2} -3x+1=0 \\ \\ D= -3 ^{2} -4*2=9-8=1 \\ \\ x_{1} = \frac{3+1}{2*2} = \frac{4}{4} =1 \\ \\ x_{2} = \frac{3-1}{2*2} = \frac{2}{4} =0.5$
Answer: x₁ = 1
     x₂ = 0,5.

№19
$2 x^{2} -4x-5=0 \\ D=-4 ^{2} -4*2*(-5)=16+40=56 \\ \\ x_{1}= \frac{4+ \sqrt{56} }{2*2} = \frac{4}{4} + \sqrt{ \frac{56}{16} } =1+ \sqrt{3.5} \\ \\ x_{2} = \frac{4- \sqrt{56} }{2*2} = \frac{4}{4} - \sqrt{ \frac{56}{16} } =1- \sqrt{3.5} 
$
Answer: x₁ = 1 + √3.5
     x₂ = 1 - √3.5

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3 years ago

A roller coaster begins at 90 feet above ground level. Then it descends 105 feet. Find the height of the coaster after the first

shepuryov [24]

It’s D 90-105 is -15

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3 years ago

Calculate the cost of 3,600 pounds of metal at 38 cents per pound, less discounts of 12%, 9%, and 3%.

scoundrel [369]

3.600 *38=136800/12=11400/9=1266.66666667/3=422.222222223 will be the answers

8 0

3 years ago

Combine the like terms to create an equivalent expression:-5r+8r+5​

Combine the like terms to create an equivalent expression:-5r+8r+5