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ladessa [460]
3 years ago
12

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:

5

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
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