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RideAnS [48]
2 years ago
7

F(t)=212-6twhat is the value of t when F (t) = 140?​

Mathematics
1 answer:
Sladkaya [172]2 years ago
8 0

Answer: -628

Step-by-step explanation:

F(140) = 212 - 6(140)

F(140) = 212 - 840

F(140) = -628

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Write an algebraic expression for 10 less than the difference of 2 times a number and 7
notka56 [123]

Answer:

(2n - 7) - 10

Step-by-step explanation:

(2n - 7) represents "difference of 2 times a number and 7"

- 10 represents "10 less"

6 0
3 years ago
Read 2 more answers
Element X is a radioactive isotope such that every 9 years, its mass decreases by half. Given that the initial mass of a sample
4vir4ik [10]

Answer:

2.9 years

Step-by-step explanation:

Given that :

Half-life t1/2 = 9 years

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A = final mass = 56 grams

t = time taken to reach final amount

Using the exponential half life relation :

A = I(0.5)^t/t1/2

56 = 70(0.5)^t/9

56/70 = 0.5^t/9

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Log 0.8 = log 0.5^t/9

−0.096910 = −0.301029 * t/9

t/9 = 0.096910 / 0.301029

t/9 = 0.3219291

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t = 2.9 years

5 0
2 years ago
1. Rudy paid for 5 trees to be delivered.
sertanlavr [38]
Here you go, hope it helps!

8 0
2 years ago
Sara is trying to find an equation for a line that passes through (5, 2) and is perpendicular to 3x + 2y = 15. Explain the steps
Anettt [7]
Not on your list, but an easy way is
.. a) swap coefficients of x and y, negating one. (Now you have 2x -3y.)
.. b) set any constant term to zero (now you have 2x -3y = 0)
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2(x -5) -3(y -2) = 0


The way you've been taught, selection C is the proper choice.

7 0
3 years ago
What is the period of a wave if the wavelength is 100 m and the speed is 200 m/s?
Iteru [2.4K]
It is A because I did 100 times 200 and I got 200,000
5 0
2 years ago
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