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2 years ago

Match each number on the left with the correct description of the number on the right.

Mathematics

1 answer:

7nadin3 [17]2 years ago

5 0

Answer:

I hope this helps you

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David burns 220 calories riding her bike each hour. He wants to burn 550 calories riding his bike at the same rate. what answer

JulijaS [17]

Answer:

Step-by-step explanation:

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3 years ago

What is the final price (before sales tax) for a set of golf clubs that cost $800 if they are on sale for 30% off?

Anastasy [175]

Answer:

D. $560

Step-by-step explanation:

800 x .3 equals 240.

800 minus 240 gives you 560

Mark me as brainliest if this helps!

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2 years ago

Barbara found that six of the 24 students in her class on a cell phone what is the ratio of students that only sell phone to stu

4vir4ik [10]

Answer:

6:24 or 1:4

Step-by-step explanation:

If you don't have to simplify, then the answer would be 6:24, but if you do, then the answer would be 1:4.

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3 years ago

Element X decays radioactively with a half-life of eight minutes. If there are 800 g of element X, how long, to the nearest 10th

Harman [31]

Answer: 41.5 min

Step-by-step explanation:

This problem can be solved with the Radioactive Half Life Formula:

$A=A_{o}.2^{\frac{-t}{h}}$ (1)

Where:

$A=22 g$ is the final amount of the radioactive element

$A_{o}=800 g$ is the initial amount of the radioactive element

$t$ is the time elapsed

$h=8 min$ is the half life of the radioactive element

So, we need to substitute the given values and find $t$ from (1):

$22 g=(800 g) 2^{\frac{-t}{8 min}}$ (2)

$\frac{22 g}{800 g}=2^{\frac{-t}{8 min}}$ (3)

$\frac{11}{400}=2^{\frac{-t}{8 min}}$ (4)

Applying natural logarithm in both sides:

$ln(\frac{11}{400})=ln(2^{\frac{-t}{8 min}})$ (5)

$-3.593=-\frac{t}{8 min}ln(2)$ (6)

Clearing $t$ :

$t=41.46 min \approx 41.5 min$ This is the time elapsed

7 0

3 years ago

The sail of a boat is in the shape of a right triangle, as shown below:

dolphi86 [110]

Answer: Choice C
7 divided by cosec 50 degrees

=====================================

Explanation:

Abbreviations:
sec = secant
cot = cotangent
cosec = cosecant (csc is also a widely used abbreviation)

-----------------

Let the horizontal leg be x

This leg is opposite the angle 50 degrees. The hypotenuse is 7

Opposite = x
Hypotenuse = 7

We'll either use the sine rule or the cosecant (csc) rule
sine = opposite/hypotenuse
cosecant = hypotenuse/opposite

Since "sine" is nowhere to be found in the answer choices, we'll use the cosecant rule

-----------

cosecant = hypotenuse/opposite
csc(angle) = hypotenuse/opposite
csc(50) = 7/x
x*csc(50) = 7
x = 7/csc(50)

This is why the answer is choice C

6 0

3 years ago

Read 2 more answers