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Valentin [98]
3 years ago
8

Richard and Teo have a combined age of 39. Richard is 3 years older than twice Teo’s age. How old are Richard and Teo

Mathematics
1 answer:
damaskus [11]3 years ago
7 0

Answer:

Teo: 12

Richard: 27

Step-by-step explanation:

Teo's age = x

Richard = 2x+3 (three years older than twice Teo's age)

If Richard+Teo=39 then x+2x+3=39

solve

3x=36

x=12

If Richard is 2x+3 then do 12*2+3=27

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mote1985 [20]

Answer:

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7 0
3 years ago
Jackson estimated 637 ÷ 78 as 640 ÷ 80. He reasoned that 64 tens divided by 8 tens should be 8 tens. Is Jackson’s reasoning corr
Sholpan [36]

Answer:

the correct solution has been explained

Step-by-step explanation:

Jackson,s reasoning is incorrect  because it should be 8 ones and not 8 tens that would give 64

\frac{640}{80} = \frac{64}{8} = 8

Moreover, \frac{637}{78}  is\ not\ equal\ to \frac{640}{8}

as \frac{637}{78}= 8.16

whereas \frac{640}{80} = 8

clearly, both quantities are different

7 0
3 years ago
Explain how you use a net to find the surface area of a prism.​
weeeeeb [17]

Answer:

Hello, Here is your answer.

Finding the areas of each of the rectangles and squares of the net of a rectangular prism and adding up those areas gives the surface area or total surface area of the prism. For example, if the length of one side of the cube 4 units then the area of one its face is 4 × 4 = 16 square units.

5 0
3 years ago
(2x2 − 5x)(4x2 − 12x + 10)<br><br> multiply
frez [133]
Is this 2x to the power of 2?
if it is then this is easy
list it out (just to show you how its solved)
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then list the other one
-5x*<span>4x2
</span>-5x*(-12x)
-5x*10
so the whole answer is
8x^4+(-24x^3)+(-20x^3)+20x^2+60x^2+(-50x)
7 0
3 years ago
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mr_godi [17]

Answer:

third option

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All of this equals to -12.

Hence: 4n + 8 = -12

6 0
3 years ago
Read 2 more answers
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