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Alenkinab [10]
4 years ago
8

Simplify to create an equivalent expression. -5(1-5k)-4(2k+5)

Mathematics
2 answers:
Alinara [238K]4 years ago
7 0

Answer:

17k-25

Step-by-step explanation:

kvasek [131]4 years ago
4 0

Answer:

17k-25

Step-by-step explanation:

-5(1-5k)-4(2k+5)

-5+25k-8k-20

17k-25

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2. Suppose (220)_b and (251)_b are the squares of consecutive integers. Determine b.
Andrei [34K]

Let x and x+1 be these consecutive integers. For some base b, we can write

(x_{10})^2=220_b=2b^2+2b

((x+1)_{10})^2=251_b=2b^2+5b+1

If

x^2=2b^2+2b

then

x^2+1=2b^2+2b+1

Now,

x^2+2x+1=2b^2+5b+1

2x+2b^2+2b+1=2b^2+5b+1

\implies2x=3b

Squaring both sides gives

4x^2=9b^2

and so

4(2b^2+2b)=9b^2

\implies8b^2+8b=9b^2

\implies b^2-8b=0\implies\boxed{b=8}

(because the base has to be non-zero)

3 0
3 years ago
Don’t answer the question
mixer [17]
Answer is 72566.52

77000-5203=71797

3840-571=3269

71797+3269=75066

75066-2500=72566

72566+0.52=72566
8 0
3 years ago
Read 2 more answers
How can you use division to find the decimal equivalent of a rational number ?
Naily [24]

Answer:

Rational numbers' decimal representations either finish or repeat a pattern. Divide the top by the bottom, the numerator by the denominator to convert fractions to decimals, and if the division doesn't come out evenly, round off after a specific number of decimal places.

Step-by-step explanation:

5 0
2 years ago
At noon, a tank contained 10 in. of water. After several hours, it contained 7 in. of water. What is the
Olin [163]
-30% answer is right because it lost 3 inches and 30 percent of 10 is 3.

Answer: -30%
5 0
3 years ago
Solve the equation -4x + 7 y equals 20. Y=3x+15
satela [25.4K]

Substitue what y equals for y and solve.

-4x+7(3x+15)=20 \\-4x+27x+105=20 \\23x=-85 \\x=-\boxed{\frac{85}{23}}

Hope this helps.

3 0
3 years ago
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