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3 years ago

Please help out :) struggling

Mathematics

1 answer:

ra1l [238]3 years ago

5 0

Answer:

Step-by-step explanation:

evaluate means to find the numerical value of the expression

substitute x=9 and y= -2 in the expression 10-4xy

10 -4*9*(-2) = 10+( -4 )(-2)*9= 10+8*9 =82

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Oshua's mother has a family Christmas gathering at 2:00. Joshua must travel 348 miles to join the festivities. He left his house

gavmur [86]

Answer:

58 miles/hour

Step-by-step explanation:

Given that the family Christmas gathering has been scheduled at 2:00 p.m.,

and Joshua left the house at 8:00 a.m.

So, the total time available in order to arrive on time to attend the Christmas gathering, t=6 hours

The total distance, Joshua has to travel, d= 348 miles.

As average speed= (total distance)/(total time)

So, the average speed of driving = 348/6=58 miles/hour

Hence, Joshua must drive at an average speed of 58 miles/hour in order to arrive on time.

7 0

3 years ago

Help help help help math

Hatshy [7]

Answer:

<6 = 158°

Step-by-step explanation:

we know a = 6

22 + a = 180

a = 180 - 22

a = 158

3 0

3 years ago

Robbie wants to buy his friend a new phone for his birthday, Robbie’s job at the mall pays about $54 and an extra $1.50 per item

poizon [28]

He'd have to sell 268 items

268x $1.50 = 402

$402 + $54 = $456

7 0

4 years ago

In hopes of encouraging healthier snacks at school, Leah brought in a tray of carrot sticks

aleksandr82 [10.1K]

Answer:

40 % of the snacks were carrot sticks.

Step-by-step explanation:

Total number of carrot sticks in lunch = 18

Total number of apple slices in lunch = 27

So, Total Snacks in the Lunch = Carrot Sticks + Apple Slices

= 18 + 27 = 45

Now, $\textrm{Percentage of Carrot Sticks} = \frac{\textrm{The number of Carrot sticks in lunch}}{\textrm{Total snacks in the lunch}} \times 100$

= $\frac{18}{45} \times100 = 40$

⇒Percentage of Carrot Sticks = 40%

Hence, 40 % of the snacks were carrot sticks.

6 0

3 years ago

Solving Square Root Worksheet (x - k)^2 Part 3

erastova [34]

Answer:

7. x = -2 +/- $4i\sqrt{5}$

8. x = 2 or x = 6

9. x = -2 +/- $\frac{\sqrt{26} }{2} i$

10. t = -3 +/- $\sqrt{35}$

Step-by-step explanation:

7. Subtract 320 from both sides: 4(x + 2)^2 = -320

Divide by 4: (x + 2)^2 = -80

Square root both sides: x + 2 = +/- $\sqrt{-80}$ . We need to add the imaginary i to this: +/- $\sqrt{-80}$ = +/- $i\sqrt{80}$ = +/- $4i\sqrt{5}$

Subtract 2 from both sides: x = -2 +/- $4i\sqrt{5}$

8. Add 18 to both sides: 7(x - 4)^2 = 28

Divide by 7: (x - 4)^2 = 4

Square root both sides: x - 4 = +/- 2

Add 4 to both sides: x = 4 +/- 2 ⇒ x = 2 or x = 6

9. Add 5 to both sides: -2(x + 2)^2 = 13

Divide by -2: (x + 2)^2 = -13/2

Square root both sides: x + 2 = +/- $\sqrt{-13/2}$ . We again need i: +/- $\sqrt{-13/2}$ = +/- $i\sqrt{13/2} =$ +/- $\frac{\sqrt{26} }{2} i$

Subtract 2 from both sides: x = -2 +/- $\frac{\sqrt{26} }{2} i$

10. Multiply by 5 on both sides: (t + 3)^2 = 35

Square root both sides: t + 3 = +/- $\sqrt{35}$

Subtract 3: t = -3 +/- $\sqrt{35}$

Hope this helps!

3 0

4 years ago

Read 2 more answers