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3 years ago

7x + 2 + 2x - 1 = 91

Mathematics

1 answer:

zhuklara [117]3 years ago

8 0

Answer: 10

Step-by-step explanation:

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What is 47.2 % of 300 ?

kupik [55]

For this type of question, you just need to multiply the percentage with the number
so, the calculation would be

47.2% x 300

47.2/100 x 300

47.2 x 3

= 141.6

6 0

4 years ago

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Two siblings ' ages have a sum of 64 years . The older sibling was born 6 years before their young sibling . Write a system of 2

ELEN [110]

Answer:

younger sibling = 29 years

older sibling = 35 years

Step-by-step explanation:

Let

x = younger sibling

y = older sibling

x + y = 64 (1)

The older sibling was born 6 years before their young sibling

x = y - 6 (2)

Substitute x = y - 6 into (1)

x + y = 64

y - 6 + y = 64

2y = 64 + 6

2y = 70

y = 70/2

y = 35 years

Substitute y = 35 into (2)

x = y - 6

x = 35 - 6

x = 29 years

6 0

3 years ago

You and three friends buy 4 movie tickets. Each person buys a $3 popcorn. The total cost is $72. Letx represent the cost of 1 mo

tiny-mole [99]

4x + 12 = 72
Mmhmm yes

6 0

3 years ago

What is amount of interest I earned on $4,000 deposited in a savings account with 4% interest compounded annually after 4 years?

amid [387]

Answer:

$ 679.43

Step-by-step explanation:

Since, the amount formula in compound interest is,

$A=P(1+\frac{r}{n})^{nt}$

Where,

P = initial amount,

r = annual rate of interest,

n = number of compounding periods in a year,

t = number of years,

Here, P = $ 4,000, r = 4% = 0.04, t = 4 years, n = 1,

So, the amount after 4 years would be,

$=4000(1+0.04)^4\approx \$4679.43$

Hence, the amount of interest,

$I=A-P=4679.43-4000 = \$ 679.43$

6 0

3 years ago

A study showed that the ratio of the number of people who get their news from social media to the number of people who their new

zhenek [66]

Answer: 270 people

Step-by-step explanation:

The ratio of the number of people who get their news from social media to the number of people who their news from other sources is 3 to 7.

This shows that the number of people who get their news from social media is 3 out of 10 i.e (3+7).

Therefore, the number of people in a town of 900 people that get their news from social media will be:

= 3/10 × 900

= 270 people.

7 0

3 years ago

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