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3 years ago

How many inches is 21 cm

Mathematics

1 answer:

Scorpion4ik [409]3 years ago

4 0

21 cm is 8.28 inches.

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1 Select the correct answer. Multiply the binomials: (3x + 4)(5x - 2) A.15x2 + 20x-8b. 15x2 + 14x-8 c. 15x2- 14x-8 D. 15x2+ 14x8

leonid [27]

Multiply the binomials:

(3x + 4)(5x - 2)

$\begin{gathered} =3x(5x\text{ - 2) + 4(5x - 2)} \\ =15x^2\text{ - 6x + 20x - 8} \\ =15x^2\text{ + 14x - 8} \end{gathered}$

Final answer

Option B is the final answer

3 0

1 year ago

Which expressions are equivalent to the one below. Check all that apply. 16^x

madam [21]

$A.\ 4^x\cdot4^x=4^{x+x}=4^{2x}\qquad\text{used}\ a^n\cdot a^m=a^{n+m}\\\\B.\ 4^{2x}=(4^2)^x=16^x\qquad\text{used}\ (a^n)^m=a^{nm}\\\\C.\ 4^2\cdot4^x=4^{2+x}\\\\D.\ (4\cdot4)^x=16^x\\\\E.\ 4\cdot4^{2x}=4^{1+2x}\\\\F.\ 4\cdot4^x=4^{1+x}\\\\Answer:\ \boxed{B.\ and\ D.}$

3 0

3 years ago

What is the sum of 5.3 x 10^5 and 3.8 x 10^4in scientific notation?

Natali5045456 [20]

Answer:

=5.68×10^5

Step-by-step explanation:

7 0

3 years ago

A store sells new video games for $55 each. The store also features $12 per used video game. Jacob is buying 3 new video games a

nikitadnepr [17]

Answer:

im pretty sure it would be a.

Step-by-step explanation:

55x3 = 165, and 12x would mean the money times the amount of used he bought. so therefore it is a.

3 0

3 years ago

a survey survey asked 200 students to name their favorite fruit the table shows the results of a survey

stiv31 [10]

Part A

Fraction of peach 2/5

Total = 200

number of students that pick peach as their favorite fruits

$\begin{gathered} =\text{ }\frac{2}{5}\text{ x 200} \\ =\text{ }\frac{2\text{ x 200}}{5} \\ =\text{ }\frac{400}{5} \\ =\text{ 80 students} \end{gathered}$

Part B

number of students that pick orange as their favorite fruits

$\begin{gathered} =\frac{3}{8}\times200^{} \\ =\text{ }\frac{3\text{ x 200}}{8} \\ =\text{ }\frac{600}{8} \\ =\text{ 75} \end{gathered}$

number of students that pick plum as their favorite fruits

$\begin{gathered} =\text{ }\frac{1}{10}\text{ x 200} \\ =\text{ }\frac{200}{10} \\ =\text{ 20} \end{gathered}$

There are 55 more students that chose orange rather than plum.

4 0

8 months ago