Ask question

Ask question

All categories

3 years ago

7

A student measured the length of a certain bar as 20 cm, which exceeded the actual length by 10% the actual length of the bar wa

s

1 answer:

N76 [4]3 years ago

6 0

Answer:

18cm

Step-by-step explanation:

20/10 = 2cm

So since 2x10 is 20 and it exceeded only 10%, we only subtract 2 from 20 which you leave you with 18cm.

You might be interested in

Jack and Jim sign up with an online music store. Jack chooses 15 downloads for $19.75, and Jim chooses 40 downloads for $43.50.

lina2011 [118]

The answer would be A. <span>The registration fee is $5.50, and the cost per download is $0.95.</span>

Solution
Let x = registration fee
y = cost/downloads

Jack
15y + x = 19.75 ; x = 19.75 - 15y
Jim
40y + x = 43.50

Thus,
40y + x = 43.50
40y + <span>19.75 - 15y = 43.50
</span>25y = 23.75
y= 0.95

for x,
<span>x = 19.75 - 15y</span>
x = 19.75 - 15( 0.95)
x= 19.75 -14.25
x = 5.5

3 0

4 years ago

Construct quadratic equation whose roots is -2/5 and -3/7,show the solving

Snowcat [4.5K]

Answer:

35x^2+29x+6=0

Step-by-step explanation:

5 0

4 years ago

Read 2 more answers

Suppose we want to choose 4 objects, without replacement, from 16 distinct objects (a) How many ways can this be done, if the or

lys-0071 [83]

Answer:

a) 1820 ways

b) 43680 ways

Step-by-step explanation:

When the order of the choices is relevant we use the permutation formula:

$P_{n,x}$ is the number of different permutations of x objects from a set of n elements, given by the following formula.

$P_{n,x} = \frac{n!}{(n-x)!}$

When the order of choices is not relevant we use the combination formula:

$C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

In this problem, we have that:

$x = 4, n = 16$

(a) How many ways can this be done, if the order of the choices is not relevant?

$C_{16,4} = \frac{16!}{4!(12)!} = 1820$

(b) How many ways can this be done, if the order of the choices is relevant?

$P_{16,4} = \frac{16!}{(12)!} = 43680$

4 0

3 years ago

Add. (5y - 1) + (-2y + 4) A) 3y - 5 B) 3y + 3 C) 7y + 3 D) 7y - 3

Ivan

(5y - 1) + (-2y + 4) = 5y - 1 - 2y + 4
= 5y - 2y - 1 + 4
= 3y + 3 [OPTION B]

8 0

3 years ago

Find 2 a for a = 3 1/4<br> 1) 6 1/2<br> 2) 6 1/4<br> 3) 23 1/4<br> 4) 5 1/2

Nataly_w [17]

Answer:

1) 6 1/2

Step-by-step explanation:

Put 3 1/4 where "a" is and do the arithmetic.

2(3 1/4) = 2·3 + 2·(1/4) = 6 2/4 = 6 1/2

4 0

4 years ago