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3 years ago

What is a rational number? A.9 B.15 C.28 D.25

2 answers:

6 0

Hi there! :) The answer to your question is all of them. A rational number is a number which can be written as a ratio. Ratios are basically fractions so the numerator and denominator are whole numbers. Whole numbers are 5,49, 688 a number WITH NO fraction. I hope I explained it well and it makes sense. ;)

Hope I helped! =)

Darina [25.2K]3 years ago

4 0

The answer is..........
A. 9

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Factor completely 2x2 − 2x − 40

Montano1993 [528]

Answer:

2(x-5)(x+4)

Step-by-step explanation:

2x^2 − 2x − 40

Factor out a 2

2(x^2 -x -20)

What 2 numbers multiply to -20 and add to -1

-5*4 = -20

-5+4 = -1

2(x-5)(x+4)

4 0

2 years ago

ZC is an altitude, m∠CYW (5x + 22)°, and m∠WZC (12x)°. Find m∠WZC

hammer [34]

Answer:

Step-by-step explanation:

ZC is an altitude, thus ∠ZCY = 90°

The sum of the3 angles in a triangle = 180°

Sum the 3 angles in ΔCYZ and equate to 180

90 + 5x + 22 + 12x = 180 ← simplify left side

17x + 112 = 180 ( subtract f112 from both sides )

17x = 68 ( divide both sides by 17)

x = 4

Hence

∠WZC = 12x = 12 × 4 = 48° → C

5 0

2 years ago

The product of two consecutive positive integers is 156. find the numbers

AlexFokin [52]

sqrt(156) = 12.489

12*13 = 156

the numbers are 12 & 13

5 0

3 years ago

Posting a screenshot, help pls.

Nikolay [14]

When h=0, that is when it hits the ground

0=70-4t-16t²
based on your previous questions, you should have learned how to complete the square

solve by copmleting the square

minus 70 both sides
-70=-4t-16t²
times both sides by -1
70=4t+16t²
16t²+4t=70
divide both sides by 16
t²+1/4t=35/8
take 1/2 of the linear coefint and square it
half of 1/4=1/8, (1/8)²=1/64
add that to both sides
t²+1/4t+1/64=35/8+1/64
factor perfect square trionomial
$(t+\frac{1}{8})^2=\frac{35}{8}+\frac{1}{64}$
$(t+\frac{1}{8})^2=\frac{280}{64}+\frac{1}{64}$
$(t+\frac{1}{8})^2=\frac{281}{64}$
square root both sides, remember to take positive and negative roots
$t+\frac{1}{8}=\frac{+/-\sqrt{281}}{8}$
minus 1/8
$t=\frac{-1+/-\sqrt{281}}{8}$

$t=\frac{-1+\sqrt{281}}{8}$ or $t=\frac{-1-\sqrt{281}}{8}$
the 2nd solution is not valid because that gives us a negative time, before the ball was dropped

so $t=\frac{-1+\sqrt{281}}{8}$ is the solution
t≈1.97

1.97 seconds

7 0

3 years ago

Explain why when you multiply and find one tenth of one tenth, it is equal to one hundredth

BlackZzzverrR [31]

A pie has 10 big slices.

Each big slice can be cut up into 10 small slices.

If you cut up every single big slice into a small slice, you've got 100 total slices.

7 0

3 years ago