Describe the mental math steps you would use to find 7 (42)

Answers

Answer 1

Answer: Break 42 into 40 + 2. Multiply 40 x 7=280 and 2 x 7=14. Then add 280 + 14 = 294.

Answer 2

Answer: If you want to do step by step, you should start by breaking 42 into 40 and 2.
Then you multiply 7 by both 40 and 2. 7 times 40 is 280. 7 times 2 is 14. You could then add the two products and you get 294.
Or you could simply multiply 7 times 42.

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Fourteen is 28% of what number?A. 7B. 50C. 14D. 42
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Is the answer to this question 84?

Answers

Answer:

yes ∠ A = 84°

Step-by-step explanation:

∠ A and ∠ B are same side interior angles and supplementary, thus

5x + 34 + 2x + 76 = 180

7x + 110 = 180 ( subtract 110 from both sides )

7x = 70 ( divide both sides by 7 )

x = 10

Thus

∠ A = 5x + 34 = 5(10) + 34 = 50 + 34 = 84°

for 15 weeks, sue put the same amount of money in a jar. then she took $9 out to spend on a friend's birthday present. she had $21 left. how much did she put in each week?

Answers

$x=amount\ she\ put\ in\ each\ week \n 15x-9=21 \n 15x=30 \n x= (30)/(15) \n x=2 \n \boxed{2\ dollars\ each\ week}$

$2 because you add the 9 back to the 21 then divide by 15 to get 2

Drew bought a chemistry book for $30. Later that book was marked down by 20%. By how much has that value been decreased? Btw please show work.

Answers

Solution:

$30 - (30*0.80) = 30 - 24 = 6$

or you can do

$30 * 0.20 = 6$

30 over 100 times 20= 6
so it decreased by 6 dollar

Randy walks 1/2 mile in each 1/5 hour. How far will Randy walk in one hour

Answers

In the given problem, it is already given that Randy can walk for a distance of 1/2 a mile in 1/5 of an hour. Now let us first convert 1/5 hour to minutes. this will make the problem a bit easy.
1/5 hour = 1/5 * 60 minutes
   = 12 minutes
So
Randy in 12 minutes can walk for a distance of = 1/2 mile
Then
In 60 minutes Randy can walk for a distance of = [1/(2*12)] * 60
   = (1/24) * 60
      = 2.5
So Randy can walk 2.5 miles in 1 hour.

HURRY PLS!!!!!!!!Let p: A car has automatic windows. Let q: A car has automatic seats. p v q is true for a total of how many cars? 40 54 66 80

Answers

Answer:

The answer is D on edgen.

Step-by-step explanation:

D. 80

(all you do is add 40, 14 and 26 from the graph)

Answer:it’s 80

Step-by-step explanation:

edg 2022 frfr

Solve by elimination
x+2y=-7
x-5y=7

Answers

$\left \{ {{x+2y=-7} \atop {x-5y=7\ \ | multiply\ by\ -1}} \right. \n\n \left \{ {{x+2y=-7} \atop {-x+5y=-7}} \right. \n+-----\n addition\ method\n\n 7y=-14 \ \ \ | divide\ by\ 7\n\n y=-2\n\n substitute\ y=-2\ to\ first\ equation\n\nx=-7-2y=-7+4=-3\n\nx=-3$

$\left\{\begin{array}{ccc}x+2y=-7\nx-5y=7&|multiply\ both\ sides\ by\ (-1)\end{array}\right\n\underline{+\left\{\begin{array}{ccc}x+2y=-7\n-x+5y=-7\end{array}\right}\ \ \ \ |add\ both\ sides\ of the\ equations\n.\ \ \ \ \ \ \ \ 7y=-14\ \ \ \ |divide\ both\ sides\ by\ 7\n.\ \ \ \ \ \ \ \ \boxed{y=-2}\n\nput\ the\ value\ of\$

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