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3 years ago

Kira is solving the equation 3(2x + 5) - (5x - 2) = 42. Her steps are shown below.

Mathematics

1 answer:

stich3 [128]3 years ago

6 0

Answer:

D)2

the minus sign outside the bracket when multiplied by a negative number in the bracket is equal to a positive number

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A farm has chickens and cows. All the cows have 4 legs and all the chickens have 2 legs.

sineoko [7]

Answer:

their are 17 cows

Step-by-step explanation:

7x2=14

82-14=68

68/4=17

5 0

2 years ago

The cost (c) to hire a dog trainer is varies directly with the amount of time (h) in hours spent training the dog.

NNADVOKAT [17]

Answer:

Part A) The proportional equation is $c=55h$

Part B) 8 hours of training

Step-by-step explanation:

we know that

A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form $y/x=k$ or $y=kx$

Let

c -----> the cost to hire a dog

h ----> the amount of time in hours

The linear equation is equal to

$c=kh$

Sue spent $660 on 12 hours of obedience training for her dog Muffin

Find the value of k (constant of proportionality)

$k=y/x$

substitute the values

$k=660/12=55$

therefore

The linear equation is

$c=55h$

For $c=\$440$

Find the value of h

substitute in the equation and solve for h

$440=55h$

$h=440/55=8\ hours$

5 0

3 years ago

If a scale drawing of a car is 3 inches and the real car is 15 feet what is the scale and the scale factor

mote1985 [20]

Answer:

Step-by-step explanation: 3x5=15

6 0

3 years ago

Maria has already written of her 1,000 word essay. If she continues writing at the same pace of 6 words per minute, which expre

neonofarm [45]

The first thing we must do in this case is to define variables:
t = time to write the words
v = write speed.
w = number of words.
The correct expression is:
t = w / v
By substituting we have:
t = 1000/6
t = 166.6666667
Rounding:
t = 167 minutes
Answer:
The correct expression is:
t = w / v
The time is:
t = 167 minutes

8 0

3 years ago

Read 2 more answers

Plz help! It is a Grade! I will do brainsiest

ikadub [295]

Answer: I can only see the big boxes so will answer them

5/6 - 1/3

Multiply the two denominators together get 18

Then multiply the bottom denominator with the opposite numerator

The sum has now changed to:

15/18 - 6/18

15 - 6 = 9

9/18 can then be simplified to 1/2

3 0

3 years ago