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ira [324]
3 years ago
7

How many whole numbers are there between 20 and 30

Mathematics
1 answer:
Leto [7]3 years ago
6 0
There are 9 whole numbers in between 20 and 30 
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a collection of dimes and quarters is worth $19.85. There are 128 coins in all. How many of each type of coin are in the collect
PolarNik [594]

Number of dimes were 81 and number of quarters were 47

<em><u>Solution:</u></em>

Let "d" be the number of dimes

Let "q" be the number of quarters

We know that,

value of 1 dime = $ 0.10

value of 1 quarter = $ 0.25

<em><u>Given that There are 128 coins in all</u></em>

number of dimes + number of quarters = 128

d + q = 128 ------ eqn 1

<em><u>Also given that collection of dimes and quarters is worth $19.85</u></em>

number of dimes x value of 1 dime + number of quarters x value of 1 quarter = 19.85

d \times 0.10 + q \times 0.25 = 19.85

0.1d + 0.25q = 19.85  -------- eqn 2

<em><u>Let us solve eqn 1 and eqn 2</u></em>

From eqn 1,

d = 128 - q -------- eqn 3

<em><u>Substitute eqn 3 in eqn 2</u></em>

0.1(128 - q) + 0.25q = 19.85

12.8 - 0.1q + 0.25q = 19.85

12.8 + 0.15q = 19.85

0.15q = 7.05

<h3>q = 47</h3>

Therefore from eqn 3,

d = 128 - q

d = 128 - 47

<h3>d = 81</h3>

Thus number of dimes were 81 and number of quarters were 47

4 0
3 years ago
PLEASE ANSWERRRRRRRRRRRRRRRRRRRRRRRR
tekilochka [14]

Answer:

a=11, b=53

Step-by-step explanation:

y=ax+b

x=1, y=64 -> 64=a+b

x=2, y=75 -> 75=2a+b

75-64=a, a=11, b=53

All the other points obey this rule.

8 0
3 years ago
Read 2 more answers
Which of the following statements shows the distributive property?
Papessa [141]

Answer:

\displaystyle 5(4 - 2) = 20 - 10

This is a genuine statement of you look real closely at it.

I am joyous to assist you anytime.

6 0
3 years ago
Please I need help on this question!!???
KonstantinChe [14]
18in x 40in  Half of 80 is 40, half of 36 is 18
9in x 20in  1/4 of 80 is 20, 1/4 of 36 is 9
5 0
3 years ago
Read 2 more answers
What is the cost of constructing a fence 6 feet, 6 inches, high around a lot measuring 90 feet by 175 feet, if the cost of erect
boyakko [2]

Answer:

The total cost is  $3,504.63

Step-by-step explanation:

Length of fence = 90 feet

Breadth of fence = 175 feet

Height of fence = 6 feet, 6 inches

1 inch = 0.0833333 feet

6 inches = 6*0.0833333 =0.4999998  feet

So, Height of fence = 6 feet + 0.49 feet =6.49 feet ≈ 6.5 feet

Perimeter = 2(Length \times breadth)=2(90 +175) = 530 feet

Cost of erecting the fence is $1.25 per linear foot

So, Cost of erecting the fence in 530 feet = 530 \times 1.25 = 662.5

Total surface area = 2(length +breadth) Height =530 \times 6.5=3445ft^2

The cost of materials is $0.825 per square foot of fence

Cost of material for 3445 sq.feet = 3445 \times 0.825 =2837.7525

So, total cost = 2842.125+662.5 = 3504.63

Hence The total cost is  $3,504.63

5 0
3 years ago
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