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3 years ago

Refer to the equation 3×-2y=-18

Mathematics

2 answers:

Ksivusya [100]3 years ago

7 0

-2y÷2=y

3×y=-18

-3 -3

y=-21

Olin [163]3 years ago

7 0

y=3 is the correct answer. First you had to remove parenthesis first. And it gave us, $-3*2y=-18$ . Then multiply by the numbers. And it gave us, $-6y=-18$ . Next, divide by -6 from both sides of equation. And it gave us, $\frac{-6y}{-6}= \frac{-18}{-6}$ . And finally simplify, and it gave us the answer is y=3 is the right answer. Hope this helps! And thank you for posting your question at here on brainly, and have a great day. -Charlie

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985.15mg

Step-by-step explanation:

Calculation for how many milligrams of the drug should he receive every 12 hours

First step is to calculate the weight in kg

255 lbs = 255/2.2 = 115.9 kg

Second step is multiply mg/kg in order to get total medicine per day

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2 years ago

Two boys and three girls are auditioning to play the piano for a school production. Two students will be chosen, one as the pian

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Answer:

30% is the correct answer.

Step-by-step explanation:

Total number of boys = 2

Total number of girls = 3

Total number of students = 5

To find:

Probability that the pianist will be a boy and the alternate will be a girl?

Solution:

Here we have to make 2 choices.

1st choice has to be boy (pianist) and 2nd choice has to be girl (alternate).

$\bold{\text{Required probability }= P(\text{boy as pianist first}) \times P(\text{girl as alternate})}$

Formula for probability of an event E is given as:

$P(E) = \dfrac{\text{Number of favorable cases}}{\text {Total number of cases}}$

For $P(\text{boy as pianist})$ , number of favorable cases are 2 (total number of boys).

Total number of cases = Total number of students i.e. 5

So, $P(\text{boy as pianist})$ is:

$P(\text{boy as pianist}) = \dfrac{2}{5}$

For $P(\text{girl as alternate})$ , number of favorable cases are 3 (total number of girls).

Now, one boy is already chosen as pianist so Total number of cases = Total number of students left i.e. (5 - 1) = 4

$P(\text{girl as alternate}) = \dfrac{3}{4}$

So, the required probability is:

$\text{Required probability } = \dfrac{2}{5}\times \dfrac{3}{4} = \dfrac{3}{10} = \bold{30\%}$

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3 years ago