Solve.What number is 31% of 70?

A. 21.7
B. 217
C. 2170
D. 21,700


Answer: A

Mathematics

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A cleaning process is removing salt from a pool. The amount S, in pounds,  of salt remaining after t hours is given in the following table. Use exponential regression to model the amount of salt remaining as a function of time. Round your answer to two decimal places.  t 1.38 4.99 8.95 12.60 15.70 S 23.62 12.48 7.10 3.41 2.10?

A.
B. ?
C. ?
D. ?

Mathematics

Determine whether the argument is valid or invalid by using a truth table.q ? pp ? r----? r ? q

A.

The argument is invalid.

B.

The argument is valid.

C.

The argument is invalid.

D.

The argument is valid.

Mathematics

Factor out the GCF.x9y8 - x9y7 + x7y5 - x6y5

A. x5y5(x3y3 + x3y2 + x + 1) B. x6y5(x2y3 - x2y2 + xy - 1) C. x6y5(x3y3 - x2y2 + x - 1) D. x6y5(x3y3 - x3y2 + x - 1)

Mathematics

P( X ? 3)

The probability density function of X is f (x) = 5 x6 over [1, ?)

Mathematics