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2 years ago

I think I got this wrong so can someone please help me and explain it to me

Mathematics

2 answers:

Ber [7]2 years ago

3 0

Answer:

the answer is c

Step-by-step explanation:

Becuase he is given 100 dollars and he uses 20 dollars a day, so you put x with 20 to calculate how many days that he can spend $20 on

arsen [322]2 years ago

3 0

Day 1: money spent = 20

Day 2: total money spent = 20+20 = 2*20

So, for x days, total spent money should be 20*x = 20x

At an instant, say, after x days.

=> saving = total amount - spent

=> money left = 100 - 20x

=> y = 100 - 2x

=> y = - 2x + 100

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Tamika has two bags of trail mix. Each has a combination of 60 pieces of fruit and nuts. Ratio of fruit to nuts in the first bag

madam [21]

Answer:

the second bag because the ratio is greater

Step-by-step explanation:

Bag1

fruits 3 : 5 nuts so 3+5=8 and 60/8=7.5 but 7.5*3=22.5

ratio is 3/5=0.428

Bag2

fruits 7 : 10 nuts so 10+7=17 and (60/17)*7 ≈ 24.7

ratio is 7/10=0.7

4 0

3 years ago

Read 2 more answers

the Wall Street Journal reported that automobile crashes cost United States $162 billion annually. The average cost per person f

Tanya [424]

Answer:

a) Margin of error = 166.311

b) sample size ≥ 62

Step-by-step explanation:

Given:

Average cost = $1599

Sample size = 50 persons

Standard deviation = $600

Confidence level is 95%

a) Margin of error = $z\frac{\sigma}{\sqrt{n}}$

Now for confidence level of 95% z-value = 1.96

Thus,

Margin of error = $1.96\frac{600}{\sqrt{50}}$

Margin of error = 166.311

b) For Margin of error ≤ 150

$z\frac{\sigma}{\sqrt{n}}$ ≤ 150

$1.96\frac{600}{\sqrt{n}}$ ≤ 150

$1.96\frac{600}{150}$ ≤ √n

√n ≥ 7.84

n ≥ 61.4656

Therefore,

sample size ≥ 62

6 0

3 years ago

$9500 is invested, part of it at 11% and part of it at 8%. For a certain year, the total yield is $937.00. How much was invested

netineya [11]

Answer:

5900 at 11%

3600 at 8%

Step-by-step explanation:

x= invested at 11%

y= invested at 8%

x+y=9500

.11x+.08y=937

Mulitply the first equation by .11

.11x+.11y= 1045

Subtract this and the second equation

(.11x+.11y)-(.11x+.08y)=1045-937

.03y=108

y=3600

SOlve for x

x+3600=9500

x=5900

8 0

3 years ago

last summer, at camp okey fun okey, the ratio of the number of boy campers to the number of the girl campers was 8:7 if there we

son4ous [18]

There are 104 boys and 91 girls. 104+91=195 104:91 = 8:7

8 0

3 years ago

Read 2 more answers

The scale on a different map is 1 inch represents 6 miles

Crank

1 inch : 6 miles

2.5 inch : x miles

2.5 * 1 = 2.5

2.5 * 6 = 15

2.5 inches is 15 miles.

8 0

3 years ago