3 years ago

Please help brainliest and 50 points for whoever answers all of these first

Mathematics

1 answer:

Lemur [1.5K]3 years ago

4 0

Answer:

my laptop doesnt let me download pdf :/

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5 The area of a rectangular lawn is 255 m². If its length is 15 m, find its perimeter.

Marina CMI [18]

Area of a rectangular lawn = l×b

255=15×x

Hence the breadth is 17 m

Hence perimeter =2(l+b)=2(15+17)=64

3 0

3 years ago

Hellllpppp plsssss just click the picture then you see it

Solnce55 [7]

Answer:

1. 8 + 13 = 13 + 8.

2. 6 + ( 12 + 4) = 6 + ( 4 + 12).

Step-by-step explanation:

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2 years ago

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A culture started with 3000 bacteria. After 2 hours it grew to 3300 bacteria. Predict how many bacteria will be present after 16

bixtya [17]

Answer:

$6,430\ bacteria$

Step-by-step explanation:

we have a exponential function of the form

$y=a(1+r)^{x}$

where

y is the population of bacteria

a is the initial value

r is the rate of growth

x is the number of hours

we have

a=3,000 bacteria

$y=3,000(1+r)^{x}$

For x=2, y=3,300

substitute

$3,300=3,000(1+r)^{2}$

$(3,300/3,000)=(1+r)^{2}$

Apply square root both sides

$1+r=\sqrt{3.3/3}$

$r=\sqrt{3.3/3}-1$

$r=0.0488$

$r=4.88\%$

substitute in the equation

$y=3,000(1+0.0488)^{x}$

$y=3,000(1.0488)^{x}$

<u><em>Predict how many bacteria will be present after 16 hours</em></u>

For x=16 hours

substitute

$y=3,000(1.0488)^{16}$

$y=6,430\ bacteria$

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3 years ago

Cherries cost $4.99 per pound. If Lacey buys 3.5 pounds, how much will she pay for the cherries?

Vladimir79 [104]

It would $17.47. if you times $4.99 by 3.5 pounds of cherries then your answer will be $17.47

4 0

3 years ago

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La formula para calcular el 30% de descuento en una tienda esta dada por la expresion y=0.30X

trapecia [35]

La formula para calcular cualquier descuento esta dada por (100 - descuento)/100

en ese caso seria Y = (1-0.3)X = 0.7X

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3 years ago