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3 years ago

Question 1 of 25

Mathematics

1 answer:

lozanna [386]3 years ago

4 0

Answer:

Step-by-step explanation:

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Simplify the expression.<br> 2x³y +7x³y-xy³

jek_recluse [69]

Answer:

xy*(2x^2 + 7x^2 - y^2)

Step-by-step explanation:

You can get xy out of the expression since all have xy

7 0

2 years ago

Simplify the expression -5+i/2i

monitta

Since ur using i as a imaginary unit, the answer is -11/2 and simplify that and u get -5 1/2.

7 0

3 years ago

Shawntee has 21 coins all of them nickel and dimes that are worth $1.70. Write a system of equations and splve

Kipish [7]

N+d=21
5n+10d=170

so

multiply first equation by -5 and add to other one

-5n-5d=-105
<u>5n+10d=170 +</u>
0n+5d=65

5d=65
divide both sides by 5
d=13

sub back

n+d=21
n+13=21
minus 13 both sides
n=8

8nickles
13 dimes

8 0

3 years ago

*FIRST ANSWER GETS BRAINLIEST*

svet-max [94.6K]

The other solution to the equation is -3.

Step-by-step explanation:

Given equation is;

5x²+bx+12=0

One solution is -4/5

We will put this solution in Eqn to get the value of b first,

$5(\frac{-4}{5})^2+b(\frac{-4}{5})+12=0\\5(\frac{16}{25})+(\frac{-4b}{5})+12=0\\\frac{16}{5}-\frac{-4b}{5}=-12\\$

Multiplying each term by 5

$5*(\frac{16}{5})-\frac{-4b}{5}*5=-12*5\\16-4b=-60\\-4b=-60-16\\-4b=-76$

Dividing both sides by -4

$\frac{-4b}{-4}=\frac{-76}{-4}\\b=19$

Putting b=19 in given Eqn

5x²+19x+12=0

Here,

a=5 , b=19 , c=12

Using quadratic formula,

$x=\frac{-b\±\sqrt{b^2-4ac}}{2a}\\x=\frac{-(19)\±\sqrt{(19)^2-4(5)(12)}}{2(5)}\\\\x=\frac{-19\±\sqrt{361-240}}{10}\\\\x=\frac{-19\±11}{10}\\$

Either, or,

$x=\frac{-19+11}{10},\ \ \ \ \ \ x=\frac{-19-11}{10}\\x=\frac{-8}{10},\ \ \ \ \ \ \ \ \ x=\frac{-30}{10}\\x=\frac{-4}{5},\ \ \ \ \ \ \ \ \ \ x= -3$

The other solution to the equation is -3.

Keywords: linear equation, quadratic formula

Learn more about quadratic formula at:

#LearnwithBrainly

6 0

3 years ago

Stacy bakes 14.5 pies in 6 hours. How many pies would she bake in 9 hours? (explain how to solve and solve and the answer)

Olenka [21]

Answer:

$21.75$ pies

Step-by-step explanation:

First, we can find the speed that Stacy takes to bake pies per hour before solving for how many pies she can bake in 9 hours.

$s=14.5pies/6hours$

$s=\frac{29}{12}pies/hour$

Pies Stacy bakes in 9 hours $=\frac{29}{12}\times9$

$=21.75$ pies

∴ Stacy bakes 21.75 pies in 9 hours

Hope this helps :)

5 0

3 years ago