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lisabon 2012 [21]
3 years ago
6

I NEED HELP ASAP PLEASEEEEvaluate the expression for r = 5. 2r2 − 10r + 40 + 2r =

Mathematics
2 answers:
Eddi Din [679]3 years ago
7 0

Answer:

50

Step-by-step explanation:

2( {5}^{2}  - 10 \times 5 + 40 + 2 \times 5) \\  = 2(25 - 50 + 40 + 10) \\  = 50

Mrrafil [7]3 years ago
4 0
Are you looking for what the answer to the equation because that is 212
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Math solve questions<br><img src="https://tex.z-dn.net/?f=9%20-%20%20%5Csqrt%7By%20-%204%20%3D%205%7D%20" id="TexFormula1" title
Whitepunk [10]

Answer:

y = 20

Step-by-step explanation:

9 -  \sqrt{y - 4}  = 5

<h3>i) move 9 to the right-hand side and change its sign</h3>

-  \sqrt{y - 4}  = 5 - 9

<h3>ii) calculate the difference</h3>

-  \sqrt{  y - 4}  =  - 4

<h3>iii) change the signs on both sides of the equation</h3>

\sqrt{y - 4}  = 4

<h3>iv) square both sides of the equation</h3>

( \sqrt{y - 4} ) {}^{2}  = 4 {}^{2}

y - 4 = 4 {}^{2}

y - 4 = 16

<h3>v) move -4 to the right-hand side and change its sign</h3>

y = 16 + 4

<h3>vi) add the numbers</h3>

y = 20

6 0
3 years ago
Read 2 more answers
How do you solve 0.8=6-2.5x
photoshop1234 [79]
X=2.08

To solve you need to first get x by itself. To do that you want to subtract 6 from both sides (get 6 away from x and put on other side) which will leave you with -5.2=-2.5x next isolate x by dividing -2.5 on both sides to then get 2.08=x
6 0
3 years ago
Read 2 more answers
Evaluate expression (5x)/9y )-1 when x =-8 and y=9
bazaltina [42]

Answer:

(5x/9y)-1

(5×-8/9×9)-1

(-40×9/9)-1

(-360/9)-1

-40-1

-41

7 0
3 years ago
What is the value of 3/4 + 1/16 in lowest terms
lidiya [134]
To get operations easier lets get their denominators equal, that would be converting both to 16, lets start with that:
(3/4) = (4/4)<span>(3/4) = 4*3/*4*4 = 12/16
so, 3/4 = 12/16 they are equivalent, we can now perform the sum easily:
</span><span>3/4 + 1/16
= </span>12/16 <span>+ 1/16
= 13/16
that is the result in the lowest terms because we cannot reduce that fraction any more.</span>
7 0
3 years ago
Read 2 more answers
I need help please and thank you!​
ziro4ka [17]

Answer:

<u>v</u><u> </u><u>is</u><u> </u><u>1</u><u>9</u><u>8</u><u> </u><u>m</u><u>/</u><u>s</u>

Step-by-step explanation:

v =  \sqrt{gh}  \\ v =  \sqrt{9.8 \times 4000}  \\ v = 198 \: m {s}^{ - 1}

8 0
3 years ago
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