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2 years ago

WILL MARK BRAINLIEST !!!

Mathematics

2 answers:

djverab [1.8K]2 years ago

8 0

I’ve attached my work
Hope it helps

Finger [1]2 years ago

5 0

Answer:

2:5

Step-by-step explanation:

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When we take a census . We attempt to collect data from a. A stratified random sample b. Every individual chosen in a simple ran

In-s [12.5K]

Answer:c

Step-by-step explanation:

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2 years ago

Fill in the box to make the equation true.<br> 5x + something - 3x=4x

Sveta_85 [38]

Answer: 2x

Step-by-step explanation: because 5+2-3=4

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3 years ago

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If cosX = -0.2, and x is in quadrant II, then what it the value of sinX

Tems11 [23]

$\sin x>0$ when $x$ is in quadrant II, so

$\cos^2x+\sin^2x=1\implies\sin x=\sqrt{1-\cos^2x}=\sqrt{1-(-0.2)^2}\approx1.02$

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3 years ago

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Two airplanes leave an airport at the same time, flying in the same direction. One plane is flying at twice the speed of the oth

Vsevolod [243]

Answer:

The slower plane has a speed of 450 km/h and the faster one has a speed of 900 km/h.

Step-by-step explanation:

Two planes:

The first one's speed is x

The second is y.

One plane is flying at twice the speed of the other.

I will say that y = 2x.

Two airplanes leave an airport at the same time, flying in the same direction

Same direction, so their relative speed is the subtraction of their speeds. 2x - x = x.

Means that after 1 hour, they will be x miles apart.

If after 4 hours they are 1800 km apart, find the speed of each plane

After 1 hour, x km apart. After 4, 1800. So

1 hour - x km apart

4 hours - 1800 km apart

4x = 1800

x = 1800/4

x = 450

2x = 2*450 = 900

The slower plane has a speed of 450 km/h and the faster one has a speed of 900 km/h.

7 0

3 years ago

While on vacation Craig bought a pair of sunglasses for $15.98 for $7.99 5 postcards and a beach towel the beach towel cost 0.50

NISA [10]

Answer:

$0.79.

Step-by-step explanation:

Let T= The price of beach towel,

P = The cost of each postcard.

S = The cost of sunglasses.

H = The cost of hat.

We have been given that while on vacation Craig bought a pair of sunglasses for $15.98. The beach towel cost 0.50 cents more than half the price of sunglasses.

We can set this information in an equation as:

$T=\frac{15.98}{2}+0.50$

$T=7.99+0.50$

$T=8.49$

We are told that Craig gave the cashier $40 and got 3.59 change and each postcard cost the same. So we can set this information in an equation as:

$T+5P+S+H=40-3.59$

Let us substitute our given values.

$8.49+5P+15.98+7.99=40-3.59$

Let us combine like terms.

$32.46+5P=36.41$

Let us subtract 32.46 from both sides of our equation.

$32.46-32.46+5P=36.41-32.46$

$5P=3.95$

Let us divide both sides of our equation by 5.

$\frac{5P}{5}=\frac{3.95}{5}$

$P=0.79$

Therefore, each postcard costs $0.79.

5 0

2 years ago