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2 years ago

the difference of two numbers is negative ten. seven times the first plus seven times the second is negative fourteen.

1 answer:

3 0

X-y=-10
x=-10-y

7x+7y=-14
7(-10-y)+7y=-14
-70-7y+7y=-14
0y=56
y=0

x=-10-y
x=-10-0
x=-10

I’m not 100% sure if this is right, so I hope someone checks this over :)

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What is the equation of a line that is parallel to the line<br> whose equation is y = x + 2?

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Answer:

y=(1)x+5

Step-by-step explanation:

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2 years ago

Samantha sends her son, Barry, to a preschool center on certain days. The cost of preschool is $45 per day along with a fixed mo

MAXImum [283]

Answer:

Step-by-step explanation:

We are given fixed monthly charge = $70.

The cost of preschool per day = $45.

Number of days = d.

Total cost of d days = cost per day × number of days + fixed monthly charge.

Therefore, we get equation

880 = 45×d+70

Now, we need to solve the equation for d.

Subtracting 70 from both sides, we get

880-70 = 45d +70-70

810=45d

Dividing both sides by 45, we get

$\frac{810}{45} =\frac{45d}{45}$

18=d.

Therefore,<em> 18 days Barry attended preschool last month.</em>

<em>Therefore, correct option is D option.</em>

4 0

2 years ago

A and b are positive integers and a-b=2. Evaluate the following:<br> 9^1/2b/3^a

OlgaM077 [116]

Answer:

$\frac{1}{ 9 }$

Step-by-step explanation:

$\huge \frac{ {9}^{ \frac{1}{2}b } }{ {3}^{a} } \\ \\ = \huge \frac{ {( {3}^{2} )}^{ \frac{1}{2}b } }{ {3}^{a} } \\ \\ = \huge \frac{ { {3}}^{2 \times \frac{1}{2}b } }{ {3}^{a} } \\ \\ \huge = \frac{ {3}^{b} }{ {3}^{a} } \\ \\ \huge = \frac{1}{ {3}^{a - b} } \\ \\ \huge= \frac{1}{ {3}^{2} } \\ ( \because \: a - b = 2)\\ \\ \huge = \frac{1}{ 9 }$

5 0

2 years ago

Perform the indicated operation.<br> 1 1/6 + 7 3/6 =<br><br> I HAVE 5 MINUTES!!!

gizmo_the_mogwai [7]

Answer:

1 1/6 - 7 3/6 = -19/

= -6 1/

≅ -6.3333333

Step-by-step explanation:

Conversion a mixed number 1 1/

to a improper fraction: 1 1/6 = 1 1/

= 1 · 6 + 1/

= 6 + 1/

= 7/

To find new numerator:

a) Multiply the whole number 1 by the denominator 6. Whole number 1 equally 1 * 6/

= 6/

b) Add the answer from previous step 6 to the numerator 1. New numerator is 6 + 1 = 7

c) Write a previous answer (new numerator 7) over the denominator 6.

One and one sixth is seven sixths

Conversion a mixed number 7 3/

to a improper fraction: 7 3/6 = 7 3/

= 7 · 6 + 3/

= 42 + 3/

= 45/

To find new numerator:

a) Multiply the whole number 7 by the denominator 6. Whole number 7 equally 7 * 6/

= 42/

b) Add the answer from previous step 42 to the numerator 3. New numerator is 42 + 3 = 45

c) Write a previous answer (new numerator 45) over the denominator 6.

Seven and three sixths is forty-five sixths

Subtract: 7/

- 45/

= 7 - 45/

= -38/

= 2 · -19/

2 · 3

= -19/

For adding, subtracting, and comparing fractions, it is suitable to adjust both fractions to a common (equal, identical) denominator. The common denominator you can calculate as the least common multiple of both denominators - LCM(6, 6) = 6. In practice, it is enough to find the common denominator (not necessarily the lowest) by multiplying the denominators: 6 × 6 = 36. In the next intermediate step, the fraction result cannot be further simplified by canceling.

In words - seven sixths minus forty-five sixths = minus nineteen thirds.

4 0

2 years ago

Help plzzzzzz!!!!!!!

goblinko [34]

I think it’s 140 I hope this helps

8 0

2 years ago