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3 years ago

How do I answer this question

Mathematics

1 answer:

viva [34]3 years ago

4 0

$\text{The formula of a circle with a center (h; k) and a radius r}\\\\(x-h)^2+(y-k)^2=r^2\\\\x^2+y^2=4\to (x-0)^2+(y-0)^2=2^2\\\\\text{therefore we have the circle with a center (0; 0) and a radius 2}\\\\x-y=1\ \ \ |-x\\-y=1-x\ \ \ |\cdot(-1)\\y=x-1\\\\for\ x=0\to y=0-1=-1\to(0;-1)\\for\ x=1\to y=1-1=0\to(1;\ 0)\\\\\text{Look at the picture}$

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Marianne is completing a 4-mile route for

Bogdan [553]

Answer:

For 1 miles distance: 7/10 of a mile she runs and 3/10 she walks.

For 4 miles distance (4 times the previous distance) she will run:

4*(7/10) = 18/20 = 2.8 miles

and walk:

4*(3/10) = 12/10 = 1.2 miles.

3 0

3 years ago

What can be added to -1 so it can be a positive 1?

Tanzania [10]

So represent missing number with x
x means unknown so
x+-1=+1
adding a negative means subtraction
x-1=1
you can do anything to an equation as long as you do it to both sides
add 1 to both sides
x+1-1=1+1
x+0=2
x=2

the number is 2

8 0

3 years ago

A survey claims that 9 out of 10 doctors recommend aspirin for their patients with headaches. to test this claim, a random sampl

gayaneshka [121]

8.3 out of 10 docters

7 0

3 years ago

Read 2 more answers

£980 is divided between Caroline, Sarah & Gavyn so that Caroline gets twice as much as Sarah, and Sarah gets three times as

Nitella [24]

Sarah has received £ 294

Solution:

Given that £980 is divided between Caroline, Sarah & Gavyn

Let "c" be the amount received by caroline

Let "s" be the amount received by sarah

Let "g" be the amount received by gavyn

Caroline gets twice as much as Sarah

amount received by caroline = twice as much as Sarah

amount received by caroline = 2(amount received by sarah)

c = 2s ---- eqn 1

Sarah gets three times as much as Gavyn

amount received by sarah = three times as much as Gavyn

amount received by sarah = 3(amount received by gavyn)

s = 3g ------- eqn 2

Given that total amount is 980

c + s + g = 980 --- eqn 3

Let us solve eqn 1, 2, 3 to get values of "c" "s" "g"

From eqn 2,

$g = \frac{s}{3}$ --- eqn 4

Substitute eqn 1 and eqn 4 in eqn 3

$2s + s + \frac{s}{3} = 980\\\\\frac{6s + 3s + s}{3} = 980\\\\6s + 3s + s = 980 \times 3\\\\10s = 2940\\\\s = 294$

Thus sarah has received £ 294

7 0

3 years ago

Ramona deposited $4,190.51 into a savings account with an interest rate of 5.2% compounded twice a year. About how long will it

kap26 [50]

A = P(1+r/2)^2t A/P = (1+r/2)^2t ln(A/P) = 2t ln((1+r/2)) ln(A/P)/ln(1+r/2) =2t ln(9000/4190.51)/ln(1+0.052/2)=2t t=15 yrs therfore ans is C.14 years ,11 months

7 0

3 years ago