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3 years ago

Which are partial products for 89 × 25?

Mathematics

2 answers:

Keith_Richards [23]3 years ago

6 0

D is the answer. hth.

lions [1.4K]3 years ago

4 0

89 × 25
partial product
80 x 20 =1600
80 x 5 = 400
9 x 20 = 180
9 x 5 = 45

answer

C. 9 X 5 = 45

D. 80 X 20 = 1600

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Which undefined term is used to define a angle

scoray [572]

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3 years ago

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If a student randomly guesses at 20 multiple-choice questions, find the probability that the student gets exactly four correct.

ad-work [718]

Answer:

Probability = 0.190

Step-by-step explanation:

Given:

Number of questions, 'n' = 20

Each question has four choices.

Let event of choosing correct answer be success and its probability be represented by 'p'.

Therefore, event of choosing wrong answer is failure and its probability be represented by 'q'.

Now, probability of success is choosing one correct answer out of 4 options. So, $p=\frac{1}{4}=0.25$

Now, 'p' and 'q' are complements of each other. Therefore,

$q=1-p=1-0.25=0.75$

Now, we need 4 successes. Therefore, $x=4$

Using Bernoulli's theorem to find 'x' successes from 'n' questions, we get:

$P(x)=_{x}^{n}\textrm{C}p^xq^{n-x}$

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$P(4)=_{4}^{20}\textrm{C}(0.25)^4(0.75)^{20-4}\\P(4)=_{4}^{20}\textrm{C}(0.25)^4(0.75)^{16}\\P(4)=4845\times (0.25)^4\times (0.65)^{16}\\\\P(4)=0.1896\approx0.190$

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3 years ago

Solve 9/10=z/8 . Round to the nearest tenth.

kompoz [17]

$\boxed {Question}$
$\frac{9}{10} = \frac{z}{8}$

$\boxed {Cross \ multiply}$
$10z = 8 \times 9$

$\boxed {Evaluate}$
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$\Longrightarrow \bf \ Answer \ : \ z = 7.2$

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4 years ago

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faust18 [17]

Answer:

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Step-by-step explanation:

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kherson [118]

Answer:

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Step-by-step explanation:

13-2x > 21

-13 -13

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(-2x)/(-2) >(8)/(-2)

x>-4

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