PLEASE HELP ME ANSWER THIS QUESTION!!!

Mathematics

1 answer:

madreJ [45]3 years ago

4 0

speed is 45 miles per hour. 135/45=3, so the answer is 3hours (A)

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1.8+3.5y+0.9+9=16.2<br><br> PLEASE HELP!!

GalinKa [24]

Solution:

$1.8 + 3.5y + 0.9 + 9 = 16.2$

subtracting 0.9 and 9 from both side

$1.8 + 3.5y + 0.9 + 9 - 0.9 - 9 = 16.2 - 0.9 - 9$

it will become

$1.8 + 3.5y = 6.3$

subtracting 1.8 from both side

$1.8 + 3.5y - 1.8 = 6.3 -1.8$

it will become

$3.5y = 4.5$

now dividing both side by 3.5

$\frac{3.5y}{3.5} = \frac{4.5}{3.5}$

$y= \frac{4.5}{3.5}$

which means

$y = 1.28$

Hope it helps!

6 0

3 years ago

The diagram shows a square with a perimeter of 20 cm.

arlik [135]

Basically that’s it but write it down by yourself

3 0

3 years ago

Simplify.<br> Rewrite the expression in the form b^n<br><br> (b^3)^2

Alexxandr [17]

Step-by-step explanation:

$a^n={\underbrace{a\cdot a\cdot a\cdot...\cdot a}_{n}$

<h2>METHOD 1.</h2>

$\left(b^3\right)^2=\underbrace{b^3\cdot b^3}_{2}=\underbrace{b\cdot b\cdot b}_{3}\cdot\underbrace{b\cdot b\cdot b}_{3}=\underbrace{b\cdot b\cdot b\cdot b\cdot b\cdot b}_{6}=b^6$

<h2>METHOD 2.</h2>

$\left(b^3\right)^2=\underbrace{b^3\cdot b^3}_{2}=b^{3+3}=b^6\qquad\text{used}\ a^n\cdot a^m=a^{n+m}$

<h2>METHOD 3.</h2>

$\left(b^3\right)^2=\left(\underbrace{b\cdot b\cdot b}_{3}\right)^2=b^2\cdot b^2\cdot b^2=b^{2+2+2}=b^6\\\text{used}\ (ab)^n=a^nb^n,\ a^n\cdot a^m=a^{n+m}$