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3 years ago

10

micheal incorrectly answered 6 out of 20 questions on his science test what percent if the questions did micheal answer correctl

y

1 answer:

iVinArrow [24]3 years ago

5 0

Answer:

70 percent

Step-by-step explanation:

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Simplify the radical expression 5√7+2√175

yanalaym [24]

$5\sqrt{7} + 2\sqrt{175}=5\sqrt{7}+2\sqrt{25 \cdot 7}=5\sqrt{7}+ 2 \cdot \sqrt{25} \cdot \sqrt{7}= \\ \\ = 5\sqrt{7}+2 \cdot 5 \cdot \sqrt{7}=5\sqrt{7}+10\sqrt{7}=\boxed{15\sqrt{7}} \approx 39.69$

remember about formula $\sqrt{ab} = \sqrt{a} \cdot \sqrt{b}$

5 0

3 years ago

Hi, could someone help me answer this please? Thanks!

rusak2 [61]

13,986

Step-by-step explanation:

Juss used a calculator, the rest guess

8 0

3 years ago

Each square on a chessboard. 2.7 inches on each side. What area of one square on chessboard. HURRY I NEED THIS TMR

kramer

2.7 * 2.7 = 7.29

Hope this helps

5 0

3 years ago

Suppose that X1 and X2 are independent random variables each with a mean μ and a variance σ^2. Compute the mean and variance of

Deffense [45]

Mean:

E[Y] = E[3X₁ + X₂]

E[Y] = 3 E[X₁] + E[X₂]

E[Y] = 3µ + µ

E[Y] = 4µ

Variance:

Var[Y] = Var[3X₁ + X₂]

Var[Y] = 3² Var[X₁] + 2 Covar[X₁, X₂] + 1² Var[X₂]

(the covariance is 0 since X₁ and X₂ are independent)

Var[Y] = 9 Var[X₁] + Var[X₂]

Var[Y] = 9σ² + σ²

Var[Y] = 10σ²

5 0

3 years ago

What is the HCF of 14 and 21?

Shkiper50 [21]

The highest common factor is seven

8 0

4 years ago

Read 2 more answers