~30 POINTS~
Please assist me on this math problem!

Answers

Answer 1

Answer: a)
$2.25*(1)/(3)=.75\n.75*.75={\boxed{.5625}$

b)
$.5625*8={\boxed{4.5}$

c)
$.5625*64={\boxed{36}$

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Four fifth of a number is more than three fourth of the number by 4. Find the number

Answers

Let the unknown number be x then given,

(4/5)x - (3/4)x = 4

(16x - 15x)/20 = 4

x/20 = 4

x=80

Let the number be n.

Four fifths of the number is 4n/5.

Three fourths of the number is 3n/4.

Four fifths of a number is more than three fourths of the number by 4.

4n/5 = 3n/4 + 4

20 * 4n/5 = 20 * 3n/4 + 20 * 4

16n = 15n + 80

n = 80

Let's check.

4/5 of 80 = 4/5 * 80 = 64

3/4 of 80 = 3/4 * 80 = 60

64 is indeed 4 more than 60 showing that 4/5 of 80 is 4 more than 3/4 of 80, so 80 is correct.

Answer: 80

The perimeter of a rectangular photograph is 28 inches. If the width of the photo is 5 inches, how tall is the photo?

Answers

Answer:

it is 9 inches tall

Step-by-step explanation:

p=2L + 2W

28=2L + 2 x 5

28=2L +10

28-10=2L

18=2L

L=9

Answer:

9 inches.

Step-by-step explanation:

Since the width of the rectangle is 5 inches, We have to times it by 2 which is 10.

Then deduct it from the perimeter of 28, which equals to 18. We have to divide it by 2 so we can find out how tall each side is. 18 divided by 2=9.

Hope that helps.

The moon is about 240,000 miles from Earth.What is this distance written as a whole number multiplied by a power of ten? SHOW YOUR WORK!! 15 points if u ANWSER NOW!!! HURRY BEFORE QUESTION DELETED

Answers

The answer is 24 multiplied by 10 to the power of 4

Tom has 100 baseball cards and 120 football cards. What is the ratio of baseball cards to football cards?

Answers

The ratio is 100:120 since you are doing baseball cards: football cards. the simplified ratio is 5:6.

The scale size is 2cm:4m

Answers

I'm not sure which one is the scale size so i'll solve for both...

Ratio is 2cm:4m
0.02m:4m or 2cm:400cm also work as ratios

400cm/2cm=200 (so the scale is 200X smaller than the original)

Option 1::

If the scale of the item is:

l=12cm and w=6cm

then we can solve for the actual size by multiplying the values by 200

l=12cm*200=2400cm or 24m

w=6cm*200=1200cm or 12m

Option 2::

If the original item has a length of 12m and a width of 6m then:

l=12m and w=6m

We can find the scale length by dividing by 200

l=12m/200=.06m or 6cm

w=6m/200=0.03m or 3cm

7. Justin takes his pulse and counts 18 heart beats in 15 s.a) What is his heart rate in beats per second?
b) What is his heart rate in beats per minute?
c) What is his heart rate in beats per hour?

Answers

Answer:

18÷15=a

18÷15×60=b

18÷15×60×60=c

~~~30 POINTS~~~Please assist me on this math problem!

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~30 POINTS~
Please assist me on this math problem!