All categories

2 years ago

The sum of twice a and 4Sorry if this isnt much info. That's all what was written in the paper

1 answer:

5 0

The way you wrote it could have 2 meanings:

Sum of twice a and 4 could be:
2a+4 or 2(a+4) which will give different results.

In the first case:
2a+4
a= 4/2
a= 2
So the sum would be 2*2+4 = 4+4 = 8

In the second case:
2(a+4) = 2a + 2*4 = 2a + 8
a= 8/2
a=4

2(4+4) = 2*8 = 16

You might be interested in

Using principle of mathematical induction prove that 6^-1 divisble by 5 .

salantis [7]

I suppose the claim is $5 \mid 6^n - 1$ for $n\in\Bbb N$ .

When $n=1$ , we have $6^1 - 1 = 6 - 1 = 5$ , and of course 5 divides 5.

Assume the claim holds for $n=k$ , that $5 \mid 6^k - 1$ . We want to use this to show it holds for $n=k+1$ , that $5 \mid 6^{k+1} - 1$ .

We have

$6^{k+1} - 1 = \left(6^{k+1} - 6\right) + \left(6 - 1) = 6\left(6^k - 1\right) + 5$

Since $5 \mid 6^k - 1$ , we can write $6^k - 1 = 5\ell$ for some integer $\ell$ . Then

$6^{k+1} - 1 = 6\cdot5\ell + 5 = 5(6\ell + 1)$

which is clearly divisible by 5. QED

5 0

1 year ago

the price of an item originally priced at $24 was increased by 15%. what percentage decrease will restore it to its original pri

konstantin123 [22]

Answer:

$20.40

Step-by-step explanation:

First of all we find the value of 10%, so we do 24 ÷ 10 which equals to 2.4, then we find the halved value of 2.4, so we do 2.4 ÷ 2 which equals to 1.2. Then we add 2.4 and 1.2 together, which then gives us 3.6 as the number. We then subtract 3.6 from 24 which gives us 20.4, but we need in money terms so we change it to $20.40. Hope this helps.

7 0

2 years ago

Carolyn has 9 quarters, 4 dimes, 7 nickels, and 2 pennies. Write and evaluate the expression to determine how much money she has

zlopas [31]

Answer:

3.02

Step-by-step explanation:

quarters are .25

dimes are .10

nickels are .05

pennies are .01

9 * .25 + 4 * .10 + 7 *.05 + 2 *.01

2.25+0.4+0.35+0.02

3.02

7 0

2 years ago

If you were to take a cross section of a right circular cone parallel to its base, what shape would you get?

Mademuasel [1]

Answer:

Step-by-step explanation:

6 0

2 years ago

Evaluate the expression. If necessary, round to the nearest hundredth. lne

Kobotan [32]

Lne equals 1 because they cancel each other out. e is the base of ln.
For example: log has a base of 10, log10 = 1

5 0

2 years ago

Read 2 more answers