3 years ago

Please help me !!! anything helps

Mathematics

1 answer:

Nataly_w [17]3 years ago

4 0

1 is 117 because 18x6.5 is 117

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Divide 30 by 10. 30mph/10seconds = 3mph/seconds

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3 years ago

A cell phone retailer used a mark-up rate of 60% on a cellphone case that originally cost $5. To find the new price of the case

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Answer:

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on a map, each centimeter represents 45 kilometers. two towns are 135 kilometers apart. what is the distance between the towns o

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i hope this helps :)

8 0

3 years ago

Please help! A-level maths.

astra-53 [7]

$x+y=k\implies y=k-x$

Substitute this into the parabolic equation,

$k-x=6-(x-3)^2\implies x^2-7x+(k+3)=0$

We're told the line $x+y=k$ intersects $C$ twice, which means the quadratic above has two distinct real solutions. Its discriminant must then be positive, so we know

$(-7)^2-4(k+3)=49-4(k+3)>0\implies k$

We can tell from the quadratic equation that $C$ has its vertex at the point (3, 6). Also, note that

$-1\le\sin t\le1\implies3\le3+2\sin t\le5\implies3\le x\le5$

and

$-1\le\cos2t\le1\implies2\le4+2\cos2t\le6\implies2\le y\le6$

so the furthest to the right that $C$ extends is the point (5, 2). The line $x+y=k$ passes through this point for $2+5=k\implies k=7$ . For any value of $k$ , the line $x+y=k$ passes through $C$ either only once, or not at all.