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OLga [1]
3 years ago
5

Benchmarks to estimate 2.81+3.72=

Mathematics
2 answers:
densk [106]3 years ago
4 0

Answer:

7

Step-by-step explanation:

Given : Numbers : 2.81 and 3.72

To Find : to estimate 2.81+3.72

Solution :

If the value after decimal is 5 or more than round off it to successive whole number other wise round off it to preceding whole number

So, estimate of 2.81 is 3

Estimate of 3.72 = 4

Now =3+4

=7

Hence 2.81+3.72=7

Gala2k [10]3 years ago
3 0
2.81+3.72=6.53 which you could estimate to 6.50 or 6.5
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En un examen de admisión de 120 preguntas, cada respuesta correcta vale 2 puntos y por cada incorrecta se quita medio punto. Un
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Answer:

Respondió mal 64 preguntas.

Step-by-step explanation:

De acuerdo a la información proporcionada puedes plantear las siguientes ecuaciones:

x+y=120 (1)

2x-0,5y=80 (2)

x es el número de preguntas correctas

y es el numero de preguntas incorrectas

Primero debes despejar "x" en (1):

x=120-y (3)

Después, debes reemplazar (3) en (2):

2(120-y)-0,5y=80

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6 0
3 years ago
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