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dexar [7]
3 years ago
5

4. A student earned an 80% on a math test. If she got 16 questions correct, how many problems were on the test? A. 13 questions

B. 18 questions C. 20 questions D. 22 questions​
Mathematics
2 answers:
choli [55]3 years ago
7 0

Answer:

20 questions on the test so C

Step-by-step explanation:

grandymaker [24]3 years ago
5 0

Answer:

20

Step-by-step explanation:

16*100/80

1600/80=20

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Keiko, Chang, and Abdul sent a total of 109 text messages over their cell phones during the weekend. Keiko sent 7 fewer messages
lbvjy [14]

9514 1404 393

Answer:

  • Keiko: 17
  • Chang: 24
  • Abdul: 68

Step-by-step explanation:

Let c represent the number of messages sent by Chang. Then Keiko sent (c-7) messages, and Abdul sent 4(c-7) messages. The total number sent was ...

  c + (c -7) +4(c -7) = 109

  6c -35 = 109 . . . . . . . . . . simplify

  6c = 144 . . . . . . . . . . . add 35

  c = 24 . . . . . . . . . . . divide by 6

  c-7 = 17

  4(c-7) = 68

Keiko sent 17, Chang sent 24, and Abdul sent 68 text messages.

5 0
3 years ago
In parallelogram ABCD, the length of BC=3x-1, CD=2x, and AD=x+5. Find the perimeter of ABCD
yarga [219]

Answer:

Step-by-step explanation:

BC=AD

3x-1=x+5

3x-x=5+1

2x=6

x=3

BC=3×3-1=8

CD=2x=2×3=6

perimeter=2(8+6)=2(14)=28

6 0
3 years ago
Simplify the expression 7(1 +5v) =​
horsena [70]
The answer is 7 + 35v
8 0
3 years ago
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In ΔCAB, point E is the midpoint of AC and point D is the midpoint of BC . If the measure of AB is 8 units, what is the measure
strojnjashka [21]

Answer:

4 units

Step-by-step explanation:

CAB and EAD are similar triangles with sides in the ratio 2:1

ED = ½ AB

½(8)

4

5 0
3 years ago
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Candace used 5/8 of her savings to buy a $531.25 laptop.  How much did she have in savings before purchasing the laptop?
Serjik [45]
x-savings\\\\\frac{5}{8}x=531,25\ \ \ \ |\cdot\frac{8}{5}\\x=850\\\\Candance\ had\ \$ 850\ savings.
3 0
3 years ago
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