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3 years ago

Pls help me ! i rlly need it !

Mathematics

1 answer:

koban [17]3 years ago

8 0

Answer:

surface area= 528 volume =480

Step-by-step explanation:

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What is minimum wage for fast food

EastWind [94]

It depends on where you live. I’d supposed you live in the United States. The average minimum wage for all of United States is $9.73 dollars.

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3 years ago

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What is 6.25 as a fraction and percent

ipn [44]

Convert the decimal by multiplying by 100.625%

Convert to a fraction by placing the decimal number over a power of 10.254

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3 years ago

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PLEASE HELP!!

Bezzdna [24]

Answer:

$y=-\dfrac{9}{40}x^2+\dfrac{441}{40}\\ \\y=-\dfrac{9}{160}x^2+\dfrac{1,521}{160}$

Step-by-step explanation:

If a parabola has its vertex on the y-axis, then its equation is

$y=ax^2+b$

This parabola passes through the point R(3,9), then

$9=a\cdot 3^2+b\\ \\9=9a+b$

The area of the right triangle PQR is

$A_{PQR}=\dfrac{1}{2}\cdot PQ\cdot QR$

Find PQ and QR, if $P(x_1,0),\ Q(3,0),\ R(3,9):$

$PQ=\sqrt{(x_1-3)^2+(0-0)^2}=|x_1-3|\\\\QR=\sqrt{(3-3)^2+(0-9)^2}=9$

Now,

$40.5=\dfrac{1}{2}\cdot |x_1-3|\cdot 9\\ \\90=9|x_1-3|\\ \\|x_1-3|=10\\ \\x_1-3=10\ \text{or}\ x_1-3=-10\\ \\x_1=13\ \text{or }x_1=-7$

We get two possible points $P_1(-7,0)$ and $P_2(13,0).$

For point $P_1:\\$

$0=a\cdot (-7)^2+b\\ \\49a+b=0$

So,

$b=-49a\\ \\9=9a-49a\\ \\-40a=9\\ \\a=-\dfrac{9}{40}\\ \\b=\dfrac{441}{40}\\ \\y=-\dfrac{9}{40}x^2+\dfrac{441}{40}$

For point $P_2:\\$

$0=a\cdot (13)^2+b\\ \\169a+b=0$

So,

$b=-169a\\ \\9=9a-169a\\ \\-160a=9\\ \\a=-\dfrac{9}{160}\\ \\b=\dfrac{1,521}{160}\\ \\y=-\dfrac{9}{160}x^2+\dfrac{1,521}{160}$

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3 years ago

Does anyone know the answer?

sattari [20]

Answer:

sis 3rd option is correct

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3 years ago

A manager earned £42000 last year this year he got a 3.5% pay raise what is his new salary

stira [4]

You take 3.5% of £42,000 and add that to £42,000, so...
0.035 (aka 3.5%) x 42,000= 1,470+42,000= 43,470...
The manager now makes £43,470

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3 years ago