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Serhud [2]
3 years ago
10

Elizabeth had 10 stamps. She decided to write letters to some of her relatives. After she sent her letters, she had 6 stamps lef

t. How many letters did she mail? A. 10 - 4 = 6 B. 60 6 = 10 C. 6 + 10 = 16 D. 10 - 6 = 4
Mathematics
1 answer:
sertanlavr [38]3 years ago
6 0
Answer is D. 10-6=4 letters
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the basketball team scored 38 points and 30 minutes at that rate how many points are they likely to score in an hour
Kitty [74]

Answer: 76 points.

Step-by-step explanation: Since the team is making 38 points in 30 minutes, and there are 60 minutes in an hour, all we need to to is double the amount of points made in 30 minutes, (38 x 2), which results in 76 points.

7 0
3 years ago
Prove this <br><br> 1-tan^2x/1+tan^2x=cos^2x-sin^2x
tatiyna

Answer:

see explanation

Step-by-step explanation:

Using the identity

tan x = \frac{sinx}{cosx}

Consider the left side

\frac{1-tan^2x}{1+tan^2x}

= \frac{1-\frac{sin^2x}{cos^2x} }{1+\frac{sin^2x}{cos^2x} } ( multiply numerator and denominator by cos²x to clear fractions

= \frac{cos^2x-sin^2x}{cos^2x+sin^2x} ← ( cos²x + sin²x = 1 ]

= cos²x - sin²x

= right side , thus proven

7 0
3 years ago
A cone has a surface area of 200 pi square inches. If the radius of the
Helen [10]

Answer:

20\:\mathrm{in}

Step-by-step explanation:

The lateral surface area of a cone is given by A=\pi r\ell, where r is the radius of the base of the cone and \ell is the cone's slant height.

Solving for \ell:

200\pi=10\pi\ell,\\\ell=\frac{200\pi}{100\pi}=\boxed{20\:\mathrm{in}}

*Note: It is implied that the surface area of 200 pi square inches is lateral surface area and not total surface area, because it is impossible to obtain a total surface area of 200 pi with a radius of 10 inches.

5 0
3 years ago
Help asap pleaseee ?:)
igomit [66]
2 and 3 are correct. 1 is false because the graph opens downward. If the a value, which is -1 in this case, is less than 0, the graph will open downward. -1 is less than 0 so the graph opens downward
4 0
3 years ago
Hana has a bag containing one red (R), one blue (B), and one yellow (Y) tile. She draws two tiles out of the bag, one after the
lana [24]

Answer:

b

Step-by-step explanation:

4 0
3 years ago
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