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Hunter-Best [27]

2 years ago

12

Maurice has 76 postcards in all. The ratio of the number of postcards he has received to the number of postcards he has bought i

s 3:1. How many more postcards has Maurice received than bought?

1 answer:

nexus9112 [7]2 years ago

4 0

Answer:

50 but if its not an estimate 50.6 i would try 50 first

Step-by-step explanation:

also brainiest plz

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Find the first 5 terms in the sequence an = 2n - 1

JulsSmile [24]

Answer:

1, 3, 5, 7, 9

Step-by-step explanation:

$a_n = 2n - 1$

n = 1:

$a_1 = 2(1) - 1 = 2 - 1 = 1$

n = 2:

$a_2 = 2(2) - 1 = 4 - 1 = 3$

n = 3:

$a_3 = 2(3) - 1 = 6 - 1 = 5$

n = 4:

$a_4 = 2(4) - 1 = 8 - 1 = 7$

n = 5:

$a_5 = 2(5) - 1 = 10 - 1 = 9$

Answer: 1, 3, 5, 7, 9

5 0

3 years ago

Oil has a volume of 9000cm cubed and a density of 0.8g/ cm cubed. what is the mass of the oil?

OlgaM077 [116]

Density = 0.8 g/cm³

Volume = 9000 cm³

D = m / V

0.8 = m / 9000

m = 0.8 x 9000

m = 7200 g

hope this helps!

5 0

3 years ago

Find a cartesian equation for the curve. r = 9 sin(θ)

Paul [167]

For this case we have the following equation:
r = 9 sin (θ)
In addition, we have the following change of variables:
y = r * sine (θ)
Rewriting the equation we have:
r = 9 sin (θ)
r = 9 (y / r)
r ^ 2 = 9y
On the other hand:
r ^ 2 = x ^ 2 + y ^ 2
Substituting values:
x ^ 2 + y ^ 2 = 9y
Rewriting:
x ^ 2 + y ^ 2 - 9y = 0
Completing squares:
x ^ 2 + y ^ 2 - 9y + (-9/2) ^ 2 = (-9/2) ^ 2
Rewriting:
x ^ 2 + 1/4 (2y-9) ^ 2 = 81/4
4x ^ 2 + (2y-9) ^ 2 = 81
Answer:
The Cartesian equation is:
4x ^ 2 + (2y-9) ^ 2 = 81

6 0

2 years ago

Describe the Glide Reflection from the preimage triangle in Black to the image triangle and red

cestrela7 [59]

We want the final coordinate of K to become (-3,1). If you reflect across the y-axis, you transform

$(x,y)\mapsto(-x,y)$

So, we need to move K to (3,1), and then reflect it across the y-axis. Since K starts at (-1,4), we have to move it 4 units to the right and 3 units down.

4 0

2 years ago

if your cell phone bill was $67.82 and there's a 7.5% late fee how much will you pay for your phone bill

kotegsom [21]

$67.82 if you pay it on time.
$90.43 if you pay it late.

8 0

3 years ago