2 years ago

How many four digit numbers cannot be divided by 5?

Mathematics

1 answer:

stiv31 [10]2 years ago

4 0

Answer:

2556

Step-by-step explanation:

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Find 2 numbers a and b such that (a-b)^2 < (a+b)(a-b)< (a+b)^2 Find two numbes a and b such that this is not true

Svet_ta [14]

Suppose for the moment that the inequality holds for all $a,b$ :

$(a-b)^2$

Expanding everything gives

$a^2-2ab+b^2$

$\implies-ab$

In particular, the inequality says that $-ab$ for any choice of $a,b$ . But if $a$ and $b>0$ , then $-ab>0$ while $ab$ .

So one possible choice of $a,b$ could be $a=-1$ and $b=1$ . Then we get

$(-1-1)^2=4$

$(-1+1)(-1-1)=2$

$(-1+1)^2=0$

but clearly it's not true that $4$ .

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2 years ago

A local charity is selling seats to a baseball game. Seats cost $20 each, and snacks cost an additional $5 each.

vlada-n [284]

Answer:

let seat as x,

and snack as y.

so the linear equation is 20x+5y=400.

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2 years ago

What is the length of the diagonal of a cube with a side length of 5 cm? Round to the nearest tenth. 7.1 cm 8.7 cm 21.3 cm 26.7

sesenic [268]

Diagonal of a cube formula: D=a√3 [a=side length]

D = 5√3 ≈ 8.7 cm.

6 0

2 years ago

Read 2 more answers

the greater of two numbers is 1 more than twice smaller. three times greater exceeds 5 times the smaller by 10. find the three n

krek1111 [17]

<h3><u>The value of the greater number is 15.</u></h3><h3><u>The value of the smaller number is 7.</u></h3>

x = 2y + 1

3x = 5y + 10

Because we have a value for x we can plug this value in to find the value of y.

3(2y + 1) = 5y + 10

Distributive property.

6y + 3 = 5y + 10

Subtract 5y from both sides.

y + 3 = 10

Subtract 3 from both sides.

y = 7

We can plug this value back into the original equation to find the value of x.

x = 2(7) + 1

x = 15

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3 years ago

I need help solving these equations because my mathematics teacher didn't explain as well.

natka813 [3]

Answer:

so to find slope for ordered pairs do y-y over x-x make sure the ordered pairs match up vertically

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2 years ago