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lisabon 2012 [21]
3 years ago
10

Mark spent a total of ₱60 in 6 days by spending half the amount he spent the previous day. What was the amount he spent on the f

irst day?
a.30.84
b.30.83
c.30.38
d30.48​
Mathematics
2 answers:
motikmotik3 years ago
6 0

Answer: 30.48

Step-by-step explanation:

Sum the series of 30.48 + (1/2)(30.48)+ (1/4)(30.48)+(1/8)(30.48)+(1/16)(30.48)+(1/32)(30.48)

Or use an Excel spreadsheet

stealth61 [152]3 years ago
6 0

Answer:

d

Step-by-step explanation:

the amount he spent on the first day: 30.48

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jarptica [38.1K]

Answer:

3 gallons

Step-by-step explanation:

Let

x ----> the amount of pure acid (100% solution) in gallons

Remember that

100\%=100/100=1

20\%=20/100=0.20

60\%=60/100=0.60

we know that

(1)(x)+(0.20)(3)=(0.60)(x+3)

solve for x

x+0.60=0.60x+1.80

x-0.60x=1.80-0.60\\0.40x=1.20\\x=3\ gal

therefore

3 gallons of pure acid should be mixed with 3 gallons of a 20% acid solution in  order to get a 60% acid solution

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3 years ago
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Alex787 [66]

Answer:

deltamath right? lol understand

Step-by-step explanation:

since there are 5 questions im gonna have to explain it to u.

for this one you need numbers that are greater than or equal to -6. So

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7 0
3 years ago
Justificantion for x=8/15
Kruka [31]
<h2>Answer:</h2>

<h2>15x=8</h2>

as according to law if a number is multiplied at one side then it will be divide to other side

so

<h2>x=8/15</h2>

Step-by-step explanation:

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Sphinxa [80]
What’s the topic on ?
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Anton [14]

Answer:

Qstn 7 answer 8x^2 - 6x

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Step-by-step explanation:

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3 years ago
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