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3 years ago

Any number multiplied by (A) 5 (B) 6 (C) 7 (D) 9 has only even products.

Mathematics

2 answers:

yaroslaw [1]3 years ago

7 0

Answer:

c 6

Step-by-step explanation:

6,12,18,24,39,36,42,48

SIZIF [17.4K]3 years ago

5 0

$\text{Your answer would be B). 6}\\\\\text{When you multiply 6 by any number, it'll always end up as a even number}\\\text{Even if you m,utliply 6 with an odd number, it'll still}\\\text{ end up as a even number}\\\\\text{If you multiply 5 with an odd number, the number would be odd}\\\\\text{If you multiply 7 with an odd number. the number would be odd}\\\\\text{If you multiply 9 with an odd number. the number would be odd}\\\\\text{Therefore, 6 would be your answer.}$

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3 years ago

Read 2 more answers

Evaluate S5 for 300 + 150 + 75 + … and select the correct answer below. 18.75 93.75 581.25 145.3125

Savatey [412]

we have that

$300 + 150 + 75 +...$

Let

$a1=300\\ a2=150\\ a3=75$

we know that

$\frac{a2}{a1} =\frac{150}{300} \\\\ \frac{a2}{a1}=0.5 \\ \\ a2=a1*0.50$

$\frac{a3}{a2} =\frac{75}{150} \\\\ \frac{a3}{a2}=0.5 \\ \\ a3=a2*0.50$

$a(n+1)=an*0.50$

Is a geometric sequence

Find the value of $a4$

$a(4)=a3*0.50$

$a(4)=75*0.50$

$a(4)=37.5$

Find the value of $a5$

$a(5)=a4*0.50$

$a(5)=37.5*0.50$

$a(5)=18.75$

Find $S5$

$S5=a1+a2+a3+a4+a5\\ S5=300+150+75+37.5+18.75\\ S5=581.25$

therefore

the answer is

$581.25$

Alternative Method

Applying the formula

$S_n=\frac{a_1 (1-r^n)}{1-r} \\\\a_1=300 \\ r=\frac{1}{2}\\\\ S_5=\frac{300(1-(\frac{1}{2})^5)}{1-\frac{1}{2}}\\\\=\frac{300(1-\frac{1}{32})}{\frac{1}{2}}\\\\=\frac{300 \times \frac{31}{32}}{\frac{1}{2}}\\\\=\frac{75 \times \frac{31}{8}}{\frac{1}{2}}\\\\=\frac{\frac{2325}{8}}{\frac{1}{2}}\\\\=\frac{2325}{8} \times 2\\\\=\frac{2325}{4}\\\\=581 \frac{1}{4}\\\\=581.25$