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aleksandrvk [35]
4 years ago
6

PLEASE HELP QUICK!!!!!

Mathematics
2 answers:
astra-53 [7]4 years ago
4 0

Answer:

8

Step-by-step explanation:

check this out!

-5(a+3)=- 55

-5a-15=- 55

-5a= -55+15

-5a= -40

-5a/-5 =-40/-5

a=8

valkas [14]4 years ago
3 0

Answer:

Choice C is correct.

Step-by-step explanation:

We have given an equation :

-5(a+3)=-55

We have to solve it for a.

-5(a+3)= -55

-5a-15= -55

Adding 15 on both sides of equation we get,

-5a =  -55+15

Multiplying 1/-5 on both sides we get,

-5a = -40

a = -40/ -5

a = 8 is the answer.

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Answer:

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Step-by-step explanation:

Para saber cual de los dos edificios es mas grande se tiene que calcular los metros cuadrados de cada edificio. Esto se calcula midiendo el largo del edificio por el ancho del edificio. Usando las medidas de la pregunta nos daria los siguientes metros cuadrados (m2)

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A chemist has 200 mL of a 10% sucrose solution. She adds x mL of a 40% sucrose solution. The percent concentration, y, of the fi
user100 [1]

Answer:

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Step-by-step explanation:

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30=\frac{0.1(200)+0.4x}{200+x} *100\\\\0.3 =\frac{0.1(200)+0.4x}{200+x}\\\\0.3(200+x)=0.1(200)+0.4x\\\\60+0.3x=20+0.4x\\\\40=0.1x\\\\x=\frac{40}{0.1} \\\\\boxed{x=400\:mL}

Thus, the chemist needs 400mL of 40% solution to get 30% concentration of the final mixture.

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Answer:

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Step-by-step explanation:

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