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3 years ago

What is 2.5(10x+8)+3x

Mathematics

2 answers:

Anon25 [30]3 years ago

7 0

Simplifying:
2.5(10x+8)+3x=0

nikitadnepr [17]3 years ago

5 0

You have to multiply 2.5 * 10x and 2.5* 8 +3x so 25x+20+3x you have to add 25+3 because both have the x in common so the final answer is 28x+20

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Which of the following best describes these estimates

Zolol [24]

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3 years ago

A) 2x + y - 12 = 0 x + y + 3 = 0

AVprozaik [17]

Answer:

x=15 and y= -18

Step-by-step explanation:

$2x + y - 12 = 0$ Equation 1

$x + y + 3 = 0$ Equation 2

From two given equations, we can find the value of both x and y by finding the value of one variable from any one of the two equations in terms of other variable and putting it to other equation.

Solving equation 1

Finding 'y' in terms of 'x' $2x+y=12\\y=12-2x$ Equation 3

Putting above equation in equation 3 in 2

$x + y + 3 = 0$

$x+12-2x+3=0$

$x=15$

Putting value of 'x' in equation 3 to find the value of 'y'

$y=12-2(15)\\y=12-30\\y= -18$

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4 years ago

Pls help I'll give brainliest!

natali 33 [55]

Answer:

Step-by-step explanation:

$t_n = {n}^{2} - 5 \\ \therefore \: t_{10} = {10}^{2} - 5 \\ \therefore \: t_{10} = 100 - 5 \\ \huge \red{ \boxed{\therefore \: t_{10} = 95 }}\\$

10th term of the sequence is 95.

3 0

3 years ago

Evaluate summation of negative quantity n minus 5 end quantity from n equals 2 to 8

nydimaria [60]

One way of doing it is by using the properties of summing things, like factoring out the minus sign: ∑n=28−(n−5)=−∑n=28(n−5)

 and splitting it up into two parts and again factor =−(∑n=28n−5∑n=281)

 The last sum is just counting how many numbers there are from 2 to 8, which is 7 (you can do it on your fingers). The first one can be calculated fast if we are clever and use this identity:

∑n=1mn=m(m+1)2

 So what we get is =−(−1+8(8+1)2−7)=8−72/2=8−36=−28.

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3 years ago

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docker41 [41]

Answer:

blury

Step-by-step explanation:

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4 years ago