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In free math answers, these are the questions asked by the students to show it in step-by-step solution.

1. In a group of cows and chickens, the number of legs was 14 more than twice the number of heads. The number of cows was:

(a) 5, (b) 7, (c) 10, (d) 12, (e) 14

Solution:

Let the number of cows be x and their legs be 4x.

Let the number of chicken be y and their legs be 2x.

Total number of legs = 4x + 2y.

Total number of heads = x + y.

The number of legs was 14 more than twice the number of heads.

Therefore, 2 × (x + y) + 14 = 4x + 2y.

or, 2x + 2y + 14 = 4x + 2y.

or, 2x + 14 = 4x [subtracting 2y from both sides].

or, 14 = 4x – 2x [subtracting 2x from both sides].

or, 14 = 2x.

or, x = 7 [dividing by 2 on both sides].

Therefore, the number of cows = 7.

Answer: (b)

4. A circle of radius 10 inches has its center at the vertex C of an

equilateral triangle ABC and passes through the other two vertices. The

side AC extended through C intersects the circle at D. The number of

degrees of angle ADB is:

(a) 15, (b) 30, (c) 60, (d) 90, (e) 120

8. A 7-in. pizza costs $8 and a 14-in. pizza costs $20. Tommy says

the smaller pizza is a better buy because the larger pizza is twice as

big and more than twice as expensive. Do you agree with his reasoning?

If not, explain why not.

Solution:

No, a pizza looks like a circle.

And we know that area of a circle depends on the radius.

So, we can clearly say that area of a circle is proportional to the square of the diameter.

Similarly, the cost a pizza depends on its area not its diameter.

9. Suppose that Jody drove 80 miles in 2 hours. Dividing 80 by 2

tells us how many miles Jody drove in each hour. The units for this rate

are miles per hour (mi/hr). If we divide 2 by 80 what information would

this give us? Give an interpretation of the rate. What units would be

used for this rate?

Solution:

We know that, speed = distance/time.

When total distance is divided by total time we get the speed.

Here, speed = distance covered in 1 hour.

According to the question,

Total distance 80 miles divided by total time 2 hours = 80/2.

miles/hour = 40 mile/hour.

Therefore, Jody drove 40 miles in 1 hour.

But if we divide total time by total distance then, we get time taken to cover 1 mile.

Similarly, if we divide 2 by 80 then, we get time taken to cover 1 mile.

Therefore, unit used for this case = hours/mile.

10. 19/6 = 4/27. Which method did you use to determine whether this proportion is true or false?

Solution:

19/6 = 4/27.

Cross multiplication:

19 × 27 = 513.

6 × 4 = 24.

We see that 513 are not equal to 24.

Therefore, we determine 19/6 = 4/27 is not proportion so, the answer is false.

11.

On Thursday Mabel handled 90 transactions. Anthony handled 10% more

transactions than Mabel, Cal handled 2/3rds of the transactions that

Anthony handled, and Jade handled 16 more transactions than Cal. How

much transactions did Jade handled?

Solution:

Mabel handled 90 transactions

Anthony handled 10% more transactions than Mabel

Anthony = 90 + 90 × 10%

= 90 + 90 × 0.10

= 90 + 9

= 99

Cal handled 2/3rds of the transactions than Anthony handled

Cal = 2/3 × 99

= 66

Jade handled 16 more transactions than Cal.

Jade = 66 + 16

= 82

Jade handled = 82 transactions.

Answer: 82

12. If a man buys 20 lollipops for $90 and sold them for $2 dollars determine his loss.

Solution:

Cost of 20 lollipops = $90

Sold each lollipop for $2

So he sold 20 lollipops for $(20 × 2) = $40

Loss = $(90 – 40) = $50

Therefore, loss = $ 50.

13 . If C is a whole number, C+1 is a whole number after that. If A is a whole number, what is a whole number before that?

Solution:

We know that the number ‘0’ together with the natural numbers gives us the numbers 0, 1, 2, 3, 4, 5, …………… which are called whole numbers.

If A is a whole number and it is greater than 0 then the whole number before that is A – 1, which will always be a whole number.

Again, when A is a whole number and it is equal to 0 then the whole number before that is A – 1 which means 0 – 1 = -1, which is not a whole number.

Therefore, if A is a whole number then the number before that will not always be a whole number.

14. Solve and leave answer in fraction

– (2-5/4)/9

Solution:

Answer: -1/12

15. Divide the cancelling out all common factors

Solution:

-((1-13/8)/10/24)

Answer: 3/2

16. The annual cost of owning and operating a car, C dollars, is a linear function of the distance, d kilometers, it is driven.

c = md + b

The cost is $4600 for 10 000 km and $9100 for 25 000 km.

(a) Determine the values of m and b.

(b) Write c as a function of d.

Solution:

(a)

c = md + b

The cost is $ 4600 for 10 000 km

4600 = m (10 000) + b

10 000 m + b = 4600

b = -10 000 m + 4600 ——- (i)

The cost is $ 9100 for 25 000 km

9100 = m (25 000) + b

9100 = 25 000 m + b

25 000 m + b = 9100

b = -25 000 m + 9100 ——— (ii)

From equation (i) and (ii) we get;

-10 000 m + 4600 = -25 000 m + 9100

-10 000 m + 25 000 m = 9100 – 4600

15 000 m = 4500

m = 4500/15 000

m = 3/10

m = 0.3

Now, put the value of m = 0.3 in equation (i) we get;

b = -10 000 (0.3) + 4600

b = -3000 + 4600

b = 1600

Answer: m = 0.3 and b = 1600

(b) c = md + b

m = 0.3

b = 1600

c = 0.3d + 1600

Answer: c = 0.3d + 1600

17. Solve using synthetic division or long division(x2 + 13x + 40) ÷ (x + 8)

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