Questions in mathematics

Questions in mathematics

[Free] A 25-ounce solution is $20 \%$ alcohol. If 50 ounces of water are added to it, what percent of the new solution is alcohol? (A) $6 \frac{2}{3} \%$ (B) $7 \frac{1}{2} \%$ (C) $10 \%$ (D) $13 \frac{1}{3} \%$

[Free] Enter a fraction. Use the forward dash (i.e. //) to create a fraction (e.g. 1/2 is the same as [tex]$\frac{1}{2}$[/tex] ). Similar: [$\square$] Similarity Statement: [$\square$] ~ [$\square$] Scale Factor: [$\square$]

[Free] Which equation shows an example of the associative property of addition? A. [tex]$4 i \cdot(-4 i+i)=(4 i-4 i)+(4 i \cdot i)$[/tex] B. [tex]$(-4 i+i)+0=(-4 i+i)$[/tex] C. [tex]$(-4+i)+4 i=-4+(i+4 i)$[/tex] D. [tex]$(-4+i)+4 i=4 i+(-4 i+i)$[/tex]

[Free] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Free] Solve the system of linear equations: [tex] \begin{array}{l} x-y=2 \ 3 x+5 y=46 \end{array} [/tex] x= y=

[Free] A sphere and a cylinder have the same radius and height. The volume of the cylinder is $18 cm^3$. What is the volume of the sphere? A. $12 cm^3$ B. $24 cm^3$ C. $36 cm^3$

[Free] What is the sum? [tex]$\frac{3}{x^2-9}+\frac{5}{x+3}$[/tex]

[Free] Select the correct answer. Consider polynomials [tex]$P$[/tex] and [tex]$Q$[/tex]. [tex] \begin{array}{l} P=8 y^4+6 y^3+8 y \\ Q=\left(5 y^2-4 y\right)\left(3 y^2+7\right) \end{array} [/tex] Which operation results in an expression equivalent to [tex]$23 y^4-6 y^3+35 y^2-20 y$[/tex]? A. [tex]$P-Q$[/tex] B. [tex]$Q-P$[/tex] C. [tex]$P+Q$[/tex] D. [tex]$P Q$[/tex]

[Free] Amanda put $1500 in a savings account. After 5 years, she had $1833 in the account. What rate of interest did she earn? Use the formula A = Pert, where A is the ending amount, P is the principal (initial amount), r is the interest rate, and t is time. A. 5% B. 3% C. 20% D. 4%

[Free] Select the correct answer from each drop-down menu. Let [tex]$d(t)$[/tex] be the total number of miles Joanna has cycled, and let [tex]$t$[/tex] represent the number of hours before stopping for a break during her ride. [tex]$d(t)=12 t+20$[/tex]