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3 years ago

PLEASE HELP!!! GIVE ME EVERY STEP TO HOW YOU GOT YOUR ANSWERS

Mathematics

1 answer:

asambeis [7]3 years ago

5 0

1) "Subtract -7a+1 from 7+a" means -7a+1 is getting taken away from 7+a, so this can be mathematically expressed as:

Starting expression: (7+a)-(-7a+1)

Distributive property with negatives: 7+a+7a-1

Combine like terms: 6+8a

So the answer for the first one is 6+8a

2) "Subtract -4v-2 from -2-5v" means -4v-2 is getting taken away from -2-5v, so this can be mathematically expressed as:

Starting expression: (-2-5v)-(-4v-2)

Distributive property with negatives: -2-5v+4v+2

Combine like terms: -v

So the answer for the second one is -v

Hope these explanations are clear.

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Perpendicular to y=-3x+11 and goes through the point (-9,-6)<br> please help it’s due next period

mafiozo [28]

Answer:

y = 1/3x - 3

Step-by-step explanation:

If the line is perpendicular to y = -3x + 11, it means that the two gradients multiply to make -1.

So the gradient of the perpendicular line is 1/3 (-3 × 1/3 = -1)

y = 1/3x + c

Next, substitute x = -9, and y = -6 to find the y intercept, or c:

-6 = 1/3(-9) + c

-6 = -3 + c

c = -6 + 3

c = -3

The equation of the line is y = 1/3x - 3

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2 years ago

In a true-false test containing 50 questions, a student is to be awarded 2 marks for every correct answer and -2 for every incor

BlackZzzverrR [31]

Answer:

1. 47 correct, 0 wrong and 3 unanswered

2. 48 correct, 1 wrong and 1 unanswered

Step-by-step explanation:

Given;

Total number of questions = 50

For correct answers = 2

For wrong answers = -2

Unanswered questions = 0

Yash scored 94 marks

Let c, w and u represent the number of correct, wrong and unanswered questions

2×c - 2 × w + 0×u = 94

2c -2w = 94 .....1

And;

c + w + u = 50 .....2

We have 2 equations and 3 unknowns

By observing the problem, we can see two possible solutions;

Case 1: Assuming he did not miss (get wrong) any answer;

He needs to score 47 answers right;

47 × 2 = 94

Then;

c = 47 w = 0 and u = 50 - (47+0) = 3

47 correct, 0 wrong and 3 unanswered

Case 2: Assuming he got one answer wrong;

He would need to score one more answer right compared to the first case;

(47+1) × 2 - 1 × 2 = 96 - 2 = 94

c = 47+1 = 48

w = 1

u = 50 - (48+1) = 1

So he need to score 48 correct answers, 1 wrong answer and 1 unanswered.

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3 years ago

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Grace [21]

The value of X=11, -6

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3 years ago

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Answer:

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Step-by-step explanation:

do 900L times the first 20 minutes to find out how much water was drained during the first 20 minutes and you get 18,000L drained

then, add 18,000L plus the rest of the 45,000L of water drained from the pool to get 63,000L of water intially in the pool

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